Cambodia reports sixth bird flu death this year

PHNOM PENH: A three-year-old Cambodian girl has died from bird flu, bringing the country's toll from the deadly virus to six so far this year, the World Health Organisation said on Wednesday.

The girl, from the southern province of Kampot, died in a children's hospital in the capital Phnom Penh, the WHO said in a joint statement with the Cambodian health ministry.

Tests confirmed she had contracted the H5N1 strain of avian influenza and "the girl had a history of coming into contact with poultry (in her village) prior to becoming sick", it added.

Cambodian Health Minister Mam Bunheng said in the statement that "H5N1 remains a serious threat to the health of Cambodians, especially children".

The country has recorded 28 cases of H5N1 since 2003, with all but three of them proving fatal.

Four Cambodians, including a 17-month-old girl, died from the strain last month and a five-year-old girl died last week.

The virus has killed more than 365 people worldwide since a major outbreak in 2003, according to WHO statistics.

It typically spreads from birds to humans through direct contact. But experts fear it could mutate into a form easily transmissible between humans, with the potential to trigger a pandemic.

- AFP/al

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Surface Pro as a gaming rig? It's ready and able

Surface Pro run Valve's Portal 2 at close to max settings.

(Credit:
Valve)

Microsoft's new Intel-powered tablet isn't being advertised as a gaming platform, but maybe it should.

The Surface Pro handles Diablo III and Portal 2 at near-maximum settings, according to a post by Jason Evangelho at Forbes.com.

Gamers "represent an important -- and arguably sizable -- potential demographic for Microsoft. As the company knows from its wildly successful
Xbox platform," he wrote.

At the moment, Microsoft is marketing Surface as a business tool, with no mention of its gaming chops.

The closest it gets is ad copy about Intel's laptop-class Core i5 processor and the ability to run applications like Adobe Photoshop.

That Intel hardware makes it rare bird for a
tablet. With a few exceptions like the Samsung ATIV Smart PC Pro 700T, tablets today use either Intel's pokey Atom processor or -- relative to Intel's mainstream chips -- slower ARM processors.

Other specs lend the tablet to running games: it packs a fast solid-state drive (often used on gaming rigs) and 1,920x1,080 display.

"The Surface Pro handles Diablo III at 1920x1080 resolution with most specs except shadows maxed out," wrote Evangelho.

Not bad for a tablet.

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Not surprisingly, House GOP pans State of the Union

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Obama: Both parties know sequester cuts "a really bad idea"

It shouldn't come as a shock that congressional Republicans weren't very impressed by President Obama's State of the Union address. 

For his part, the president didn't hide his suggestion that it's Republicans who are resistant to compromise, leading some Republicans to jab the president, particularly regarding his lack of clarity on how he would replace the so-called sequester cuts set to slash defense and domestic spending on March 1.

"What has he done?" asked Rep. Cory Gardner, R-Colo. "He signed the sequester, he agreed to the sequester, he came up with the sequester and then he complains about House solutions to actually try to deal with it. This president is more interested in campaign-style rhetoric than actual solutions."

While many said there is some room to work with Mr. Obama on issues like immigration, and even some gun safety measures, his new proposals on everything from education to repairing the nation's crumbling bridges were panned not necessarily based on merit, but on the president's claim that the new programs would not increase the deficit "by a single dime."

"I think it doesn't pass the laugh test" said the chairman of the conservative House Republican Study group Rep. Steve Scalise, R-La. "People realize the President promised to cut the deficit in half and it's more than doubled."

"It's economic fairy dust that this President's working with," added Gardner.

On the president's call to address climate change and become more energy independent, Rep. Lee Terry, R-Neb., called the president's silence on giving the green light to construct the Keystone XL pipeline to pump oil from Canada to the Gulf of Mexico "deafening."

Chairman of the House Energy and Commerce Committee Fred Upton, R-Mich., also said "With a stroke of the pen, the president could unleash this $7 billion private sector investment. Yet nowhere in this evening's blueprint for the president's policy vision was this critical middle-class jobs project."

Rep. Raul Labrador, R-Idaho, who is expected to be a key House Republican player in immigration talks as a Hispanic-American from a conservative state, said the president's State of the Union this year was "one of the least inspiring speeches I ever heard him give."

But Labrador said he does think Republicans and Democrats will ultimately be able to come together on an overhaul of the nation's immigration system.

"As long as the president and his party don't draw a red line and say that they have to get everything that they want."

Labrador was less optimistic about gun control. He compared his home state of Idaho with low crime and few gun regulations to Mr. Obama's home state of Illinois as an example of why gun laws aren't necessarily effective.

"It has the most stringent gun control legislation and it has some of the highest crime in the United States" Labrador said of Illinois. "Clearly gun control is not going to protect those families."

And while Labrador said he believes the president cares about the victims of gun violence and their families that attended the speech, he said they should not be used as "political pawns."

Labrador said, however, that as a father of five children he was so upset by the Sandy Hook Elementary School massacre that he could not speak of the shooting for two days. He said "if there's things that we can do to save lives without violating the second amendment I think we should consider it."

Democrats gave the speech high marks. In a statement, Minority Leader Nancy Pelosi, D-Calif., said she urged the two parties to work together and said "it is time to heed the President's call for real progress to reverse the rising tide of climate change, enact comprehensive immigration reform, and prevent gun violence."

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State of the Union: Obama Pushes Job Creation

Pursuing an aggressive and diverse early second-term agenda, President Obama turned his focus Tuesday night squarely to the economy, using his State of the Union address to unveil new government initiatives aimed at creating jobs.

The defining duty of the new Congress and new administration is to "reignite the true engine of America's economic growth -- a rising, thriving middle class," Obama said Tuesday night from the House chamber.

"That must be the North Star that guides our efforts," he said.

Obama's proposals had a familiar ring, including re-packaged economic ideas but also offering several bold new measures aimed at boosting the middle class.

None of the proposals would add to the deficit "by a single dime," Obama pledged, with costs offset by savings carved out in the budget and from money saved from ending two wars.

"It's not a bigger government we need, but a smarter government that sets priorities and invests in broad-based growth," Obama said.

For the first time as president, Obama called for raising the minimum wage from $7.25 to $9.00 an hour by 2015. He proposed to ensure future increases by indexing the minimum wage to inflation.

He proposed a national goal of universal pre-school education, an effort to help states provide tens of thousands of low- to middle-income four-year-old children access to quality public education from an earlier age.

Charles Dharapak/Pool/AP Photo

Obama: A Rising Middle Class Should Be 'North Star' Watch Video

Obama Wants Minimum Wage: 'A Wage You Can Live On' Watch Video

Obama Announces Afghanistan Troop Withdrawal Watch Video

And, to heal the nation's crumbling roads and bridges, Obama offered a $50 billion "fix it first" infrastructure program that would prioritize repair of existing structures before building new ones.

"Every day, we should ask ourselves three questions as a nation," Obama said. "How do we attract more jobs to our shores? How do we equip our people with the skills needed to do those jobs? And how do we make sure that hard work leads to a decent living?"

Answers to those questions, the president suggested, include redoubling investments in clean energy technologies -- a step which he said would both benefit the environment and reduce U.S. dependence on foreign oil.

"For the sake of our children and our future, we must do more to combat climate change," he said.

He called for doubling the amount of renewable electricity generation in the U.S. by 2020, and announced an energy version of his "Race to the Top" education program that would give states grants for the best energy efficiency programs.

Related: 7 Things Obama Says at Every State of the Union

In tandem with his economic focus, Obama announced the withdrawal of 34,000 U.S. troops from Afghanistan by this time next year, cutting in half the current force and marking a quickened pace for the final exit of U.S. combat forces by a 2014 deadline.

There are currently 66,000 U.S. troops serving in Afghanistan. Obama has vowed to bring nearly all of them home by the end of next year, though a small contingent will likely remain to train Afghan forces and assist counterterrorism operations, officials have said.

Obama touched briefly on his recently-unveiled proposals to overhaul the nation's immigration system, expand rights for gay and lesbian Americans and curb an epidemic of gun violence.

With dozens of victims of gun violence looking on from the House gallery, including former Rep. Gabby Giffords, and families of victims from shootings at Newtown, Conn., Oak Creek, Wisc., and Aurora, Colo., Obama made an emotional plea for an up-or-down vote on his gun control plan.

"Each of these proposals deserves a vote in Congress," he said of proposed restrictions on assault-style weapons and high capacity magazines, and enhanced background checks, among other measures.

"If you want to vote no, that's your choice," he said. "But these proposals deserve a vote. Because in the two months since Newtown, more than a thousand birthdays, graduations and anniversaries have been stolen from our lives by a bullet from a gun."

Read More: President Obama's Past State of the Union Promises

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U.S. says to take lead to contain North Korea

SEOUL (Reuters) - U.S. President Barack Obama said North Korea's third nuclear test, in defiance of U.N. resolutions, was a threat and a provocation and that the United States would lead the world in responding.

North Korea has said Tuesday's test was an act of self-defense against "U.S. hostility" and threatened stronger steps if necessary.

"Provocations of the sort we saw last night will only isolate them further, as we stand by our allies, strengthen our own missile defense, and lead the world in taking firm action in response to these threats," Obama said in his State of the Union address, delivered 24 hours after the North's test.

North Korea tested nuclear devices in 2006 and 2009. But despite the three tests and a long-range rocket launch, it is not believed to be close to manufacturing a nuclear missile capable of targeting the United States.

But Washington believes the isolated state's ultimate aim is to design an intercontinental ballistic missile capable of carrying a nuclear warhead that could reach the continental United States. North Korea says its rocket program is aimed at putting satellites in space.

The latest test has drawn condemnation from around the world, including from China which for years has been the North's only major ally.

The U.N. Security Council held an emergency meeting at which its members, including China, "strongly condemned" the test and vowed to start work on appropriate measures in response, the president of the council said.

North Korean leader Kim Jong-un, the third member of his family to rule, has presided over two long-range rocket launches and a nuclear test during his first year in power, pursuing policies that have propelled his impoverished and malnourished country closer to becoming a nuclear weapons power.

North Korea said the test had "greater explosive force" than those in 2006 and 2009. Its KCNA news agency said it had used a "miniaturised" and lighter nuclear device, indicating it had again used plutonium, which is suitable for use as a missile warhead.

EXASPERATED

China, which has shown signs of increasing exasperation with the recent bellicose tone of its reclusive neighbor, summoned the North Korean ambassador in Beijing and protested sternly, the Chinese Foreign Ministry said.

Foreign Minister Yang Jiechi said China was "strongly dissatisfied and resolutely opposed" to the test and urged North Korea to "stop any rhetoric or acts that could worsen situations and return to the right course of dialogue and consultation as soon as possible".

Analysts said the test was a major embarrassment to China, which is a permanent member of the Security Council and North Korea's sole major economic and diplomatic ally.

Obama said the test would be a setback for North Korea's economic development.

"The regime in North Korea must know that they will only achieve security and prosperity by meeting their international obligations," he said.

U.S. ambassador to the United Nations Susan Rice said Washington and its allies intended to "augment the sanctions regime" already in place due to Pyongyang's previous atomic tests. North Korea is already one of the most heavily sanctioned states in the world and has few external economic links that can be targeted.

Japanese Prime Minister Shinzo Abe said the test was a "grave threat" that could not be tolerated.

Russian Foreign Minister Sergei Lavrov urged North Korea to abandon its nuclear arms program and return to talks. NATO condemned the test as an "irresponsible act."

South Korea, still technically at war with North Korea after a 1950-53 civil war ended in a truce, also denounced the test. Obama spoke to South Korean President Lee Myung-bak on Tuesday and told him the United States "remains steadfast in its defense commitments" to South Korea, the White House said.

MAXIMUM RESTRAINT

North Korea's Foreign Ministry said the test was "only the first response we took with maximum restraint".

"If the United States continues to come out with hostility and complicates the situation, we will be forced to take stronger, second and third responses in consecutive steps," it said in a statement carried by the KCNA news agency.

North Korea - which gave the U.S. State Department advance warning of the test - often threatens the United States and its "puppet", South Korea, with destruction in colourful terms.

North Korea told the U.N. disarmament forum in Geneva that it would never bow to resolutions on its nuclear program and that prospects were "gloomy" for the denuclearization of the divided Korean peninsula because of a "hostile" U.S. policy.

The magnitude of the explosion was roughly twice that of the 2009 test, according to the Vienna-based Comprehensive Nuclear-Test Ban Treaty Organization.

U.S. intelligence agencies were analyzing the event and found that North Korea probably conducted an underground nuclear explosion with a yield of "approximately several kilotons", the Office of the Director of National Intelligence said.

Nuclear experts have described the previous two tests as puny by international standards. The yield of the 2006 test has been estimated at less than 1 kiloton (1,000 tons of TNT equivalent) and the second at some 2-7 kilotons, compared with 20 kilotons for a Nagasaki-type bomb.

Initial indications are that the test involved the latest version of a plutonium-based prototype weapon, according to one current and one former U.S. national security official. Both previous tests involved plutonium. If it turns out the test was of a new uranium-based weapon, it would show that North Korea had made more progress on uranium enrichment than previously thought.

"VICIOUS CYCLE"

When Kim Jong-un, who is 30, took power after his father's death in December 2011, there were hopes that he would bring reforms and end Kim Jong-il's "military first" policies.

Instead, North Korea, whose economy is smaller than it was 20 years ago and where a third of children are believed to be malnourished, appears to be trapped in a cycle of sanctions followed by further defiance.

"The more North Korea shoots missiles, launches satellites or conducts nuclear tests, the more the U.N. Security Council will impose new and more severe sanctions," said Shen Dingli, a professor at Shanghai's Fudan University.

"It is an endless, vicious cycle."

Options for a response from the international community appear to be few. Diplomats at the United Nations said negotiations on new sanctions could take weeks since China is likely to resist tough new measures for fear they could lead to further retaliation by the North Korean leadership.

Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as Obama begins his second term.

The North's longer-term game plan may be to restart international talks aimed at winning food and financial aid. China urged it to return to the stalled "six-party" talks on its nuclear programme, hosted by China and including the two Koreas, the United States, Japan and Russia.

(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau and Michelle Nichols at the UNITED NATIONS; Fredrik Dahl in VIENNA; Michael Martina and Chen Aizhu in BEIJING; Mette Fraende in COPENHAGEN; Adrian Croft, Charlie Dunmore and Justyna Pawlak in BRUSSELS; Mark Hosenball, Paul Eckert, Roberta Rampton, Tabassum Zakaria and Jeff Mason in WASHINGTON; Editing by Raju Gopalakrishnan)

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Obama rebukes North Korea over test

WASHINGTON: US President Barack Obama said Tuesday that North Korea's "provocative" nuclear test did not make it more secure and called for "swift" and "credible" international action in response.

Obama also vowed in a written statement that Washington would remain vigilant in the face of the underground detonation by the Stalinist state and steadfast in its defense commitments to its allies in Asia.

"These provocations do not make North Korea more secure," Obama said.

"Far from achieving its stated goal of becoming a strong and prosperous nation, North Korea has instead increasingly isolated and impoverished its people through its ill-advised pursuit of weapons of mass destruction and their means of delivery."

Obama complained that the test was a "highly provocative act" that -- following the North's December 12 ballistic missile launch -- undermined regional stability and violated UN Security Council resolutions.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community," Obama said, ahead of an emergency meeting of the UN Security Council called for later on Tuesday.

"The United States will also continue to take steps necessary to defend ourselves and our allies," Obama said.

- AFP/ck

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Foursquare debuts venue pages to share with non-members

Foursquare launched its shareable mobile venue pages for non-members today, as it continues down the path of becoming less of a social network and more of a recommendation search engine -- a la Yelp.

"Foursquare has tons of helpful information about places, like photos, menu items, and great tips from insiders and local experts," the company wrote in a blog post today. "When you Tweet, post to Facebook, email or text about a place with friends who don't have Foursquare on their phones, they'll be linked to a shiny new page showing all the most important info about it."

The shareable venue pages highlight user tips and photos; they also have essential information like the address and hours of the store, restaurant, park, or other spot. To share a page with friends -- including non-Foursquare members -- users just tap the "share" button while in the social network's mobile app.

Foursquare has been continuing to morph from a check-in social network to a more comprehensive location search engine -- putting it in direct competition with other recommendation and rating services, such as Yelp.

In November, the company launched its 10-point scoring system for local business and in October it launched its new Web site, which is open to nonmembers and has a prominent search box. The company has also been in the process of adding more specific information to its listings, like when a place is open and prices.

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State of the Union guests reflect nation's hot-button issues

Several lawmakers are bringing special guests to President Obama's State of the Union address Tuesday night in order to make a statement.

Several lawmakers are bringing guests to help underscore the importance of gun control. More than 20 House Democrats are bringing guests who have been personally affected by gun violence. A bipartisan pair of Arizona lawmakers, meanwhile, will host former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly.

Other lawmakers are bringing guests tied to issues like immigration and voting rights.

Below is a partial list of officials and the guests they are bringing. CBS News will update the list as more guests are confirmed:

First Lady Michelle Obama:

• Lt. Brian Murphy, who was wounded while responding to the Sikh Temple shooting last August in Oak Creek, Wisconsin. He was struck by 15 bullets.
• Cleopatra Cowley-Pendleton and Nathaniel Pendleton Sr., parents of 15-year-old Hadiya who was killed in a Chicago park.
• Desiline Victor, a 103-year-old Florida woman who waited in line for several hours to vote.
• Tim Cook, CEO of Apple.

House Minority Leader Pelosi:

• Mother and daughter from Newtown, Conn. The 4th grader sent Pelosi a letter asking for her support to strengthen gun laws in the wake of the Sandy Hook massacre.

Sen. John McCain, R-Ariz., and Rep. Ron Barber, D-Ariz.:

• Former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly

Rep. Steve Stockman, R-Texas:

• Musician and gun advocate Ted Nugent

Sens. Richard Blumenthal, D-Conn., and Chris Murphy, D-Conn.:

• First Selectwoman Pat Llodra, a Republican and the Chief Executive Officer of Newtown
• Newtown Detectives Jason Frank and Dan McAnaspie, two of several first responders who rushed to Sandy Hook Elementary School on the day of the tragedy

Rep. Luis Gutierrez, D-Ill.:

• Undocumented immigrant Gabino Sanchez. The South Carolina husband and father of two U.S. citizen children is fighting deportation. Sanchez entered the country when he was 15 years old and has been working and living peacefully in the U.S. ever since.

Sen. Dianne Feinstein, D-Calif.:

• Josh Stepakoff, who in 1999 was shot at the North Valley Jewish Community Center in Granada Hills, Calif. Stepakoff, now 20, is a student at California State University Northridge.

Sen. Frank Lautenberg, D-N.J.:

• Matt Gross, a New Jersey native who was shot in the head in 1997, at the age of 27. Gross was one of several victims wounded during a shooting attack on the observation deck of the Empire State Building.

More House Democrats bringing guests affected by gun violence:

Rep. Jim Langevin, R.I.

Rep. Keith Ellison, Minn.

Rep. Carolyn McCarthy, N.Y.

Rep. Rosa DeLauro, Conn.

Rep. David Cicilline, R.I.

Rep. Diana DeGette, Colo.

Rep. Tammy Duckworth, Ill.

Rep. Elizabeth Esty, Conn.

Rep. Lois Frankel, Fla.

Rep. Lujan Grisham, N.M.

Rep. Janice Hahn, Calif.

Rep. Jim Himes, Conn.

Rep. Alan Lowenthal, Calif.

Rep. Gloria Negrete-McLeod, Calif.

Rep. Eleanor Holmes Norton, D.C.

Rep. Ed Perlmutter, Colo.

Rep. Jan Schakowsky, Ill.

Rep. Brad Schneider, Ill.

Rep. Bobby Scott, Va.

Rep. Mike Thompson, Calif.

Rep. Krysten Sinema, Ariz.

Rep. Chris Van Hollen, Md.

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North Korea Says it Has Conducted a Nuclear Test

North Korea says it has successfully tested a miniaturized nuclear device Tuesday, according to state media.

A large tremor measured at magnitude 4.9 was detected in North Korea and governments in the region scrambled to determine whether it was a nuclear test that the North Korean regime has vowed to carry out despite international protests.

Official state media said the test was conducted in a safe manner and is aimed at coping with "outrageous" U.S. hostility that "violently" undermines the North's peaceful, sovereign rights to launch satellites. Unlike previous tests, North Korea used a powerful explosive nuclear bomb that is smaller and lighter, state media reported.

President Obama called the test "a highly provocative act" in a statement Tuesday morning.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies,"Obama said.

"The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region," he added.

The U.N. Security Council will hold an emergency meeting on North Korea's nuclear test later this morning.

Suspicions were aroused when the U.S. Geological Survey said it had detected a magnitude 4.9 earthquake Tuesday in North Korea.

The Comprehensive Test Ban Treaty Organization told ABC News, "We confirm that a suspicious seismic event has taken place in North Korea."

North Korea Threatens More Nuclear Tests, Warns U.S. Watch Video

"The event shows clear explosion-like characteristics and its location is roughly congruent with the 2006 and 2009 DPRK (North Korea) nuclear tests," said Tibor Toth, executive secretary of the organization.

"If confirmed as a nuclear test, this act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation," Toth said in a statement on the organization's web site.

Kim Min-seok, a South Korean Defense Ministry spokesman, told reporters that North Korea informed United States and China that it intended to carry out another nuclear test, according to the AP. But U.S. officials did not respond to calls from ABC News Monday night.

The seismic force measured 6 to 7 kilotons, according to South Korea.

"Now that's an absolutely huge explosion by conventional terms. It's a smallish, but not tiny explosion by nuclear terms. It's about two-thirds the size of the bomb that the U.S. dropped on Hiroshima," James Acton, a Senior Associate at the Carnegie Endowment for International Peace, told ABC News.

North Korea threatened in January to carry out a "higher-level" test following the successful Dec. 12 launch of a long range rocket. At the time, North Korea's leader Kim Jong-Un said his country's weapons tests were specifically targeting the United States.

The suspicious tremor comes just hours before President Obama is to give the State of the Union address, and it marks the first diplomatic test in the region for new Secretary of State John Kerry.

Also, South Korea's new president, Park Geun-hye, is scheduled to be sworn in on Feb. 25. One of North Korea's biggest holidays, Kim Jong-il's birthday, falls on Feb. 16.

China, North Korea's main ally in the region, has warned North Korea it would cut back severely needed food assistance if it carried out a test. Each year China donates approximately half of the food North Korea lacks to feed its people and half of all oil the country consumes.

Both of North Korea's previous tests used a plutonium-based method for making bomb fuel. The first was deemed a failure, the second only slightly less so. If the most recent test used HEU (highly enriched uranium), a far more difficult-to-detect method of producing bomb fuel, it would be a significant and worrisome step forward for North Korea's weapons program.

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North Korea conducts third nuclear test, angering U.S., Japan

SEOUL (Reuters) - North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and likely to infuriate its only major ally, China, and increase penalties against Pyongyang.

The North said the test had "greater explosive force" than the 2006 and 2009 tests that were widely seen as small-scale. Its KCNA news agency said it had used a "minituarized" and lighter nuclear device, indicating that it had again used plutonium which is more suitable for use as a missile warhead.

North Korean leader Kim Jong-un, the third of his line to rule the country, has now presided over two long-range rocket launches and a nuclear test during his first a year in power, pushing policies that have propelled his impoverished and malnourished country ever closer to becoming a nuclear weapons power.

U.S. President Barack Obama said the test was a "highly provocative act" that hurt stability in the region and called its nuclear program a threat to U.S. and international security.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies," Obama said in a statement.

Japanese Prime Minister Shinzo Abe said the test was a "grave threat" that could not be tolerated. U.N. Secretary-General Ban Ki-moon said the test was a "clear and grave violation" of U.N. Security Council resolutions.

South Korea said the size of the seismic activity indicated a nuclear explosion slightly larger than the North's two previous tests at 6-7 kilotons, although that is still relatively small. The Hiroshima bomb was around 20 kilotons.

The U.S. Geological Survey said that a seismic event measuring 5.1 magnitude had occurred on Tuesday, with North Korea later confirming the nuclear test.

"It was confirmed that the nuclear test that was carried out at a high level in a safe and perfect manner using a miniaturized and lighter nuclear device with greater explosive force than previously did not pose any negative impact on the surrounding ecological environment," KCNA said.

The test prompted the U.N. Security Council to call for an emergency meeting later on Tuesday. It likely to be a major embarrassment for Beijing, the North's sole major economic and diplomatic ally.

"The test is hugely insulting to China, which now can be expected to follow through with threats to impose sanctions," said Mark Fitzpatrick of the International Institute for Strategic Studies think tank.

North Korea trumpeted the announcement on its state television channel to patriotic music against the backdrop of an image of its national flag.

It linked the test to its technical prowess in launching a long-range rocket in December, a move that triggered the U.N. sanctions, backed by China, that Pyongyang said prompted it to carry out Tuesday's nuclear test.

The North's ultimate aim, Washington believes, is to design an intercontinental ballistic missile capable of carrying a nuclear warhead that could hit the United States. North Korea says the program is aimed merely at putting satellites in space.

North Korea used plutonium in previous nuclear tests and prior to Tuesday there had been speculation it would use highly enriched uranium so as to conserve its plutonium stocks as testing eats into its limited supply of the material that could be used to construct a nuclear bomb.

Despite its three nuclear tests and long-range rocket tests, North Korea is not believed to be close to manufacturing a nuclear missile capable of hitting the United States.

SANCTIONS AND DIPLOMATIC FALLOUT

Japan immediately called for more sanctions against North Korea and South Korea's defense ministry said additional nuclear tests and rocket launches by the North should not be ruled out.

"This is a grave problem for our country's national security and we must be extremely concerned," Kyodo news agency quoted Japanese Defence Minister Itsunori Onodera as telling reporters.

South Korea's Yonhap news agency said Pyongyang had informed China and the United States of its plans to test on Monday, although this could not be confirmed.

When new leader Kim, now aged 30, took power after his father's death in December 2011, there were hopes the he would bring reforms and end Kim Jong-il's "military first" policies.

Instead of which, the North, whose economy is smaller than it was 20 years ago and where a third of children are believed to be malnourished, appears to be trapped in a cycle of sanctions followed by further provocations.

"The more North Korea shoots missiles, launches satellites or conducts nuclear tests, the more the U.N. Security Council will impose new and more severe sanctions," said Shen Dingli, a professor and regional security expert at Shanghai's Fudan University.

"It is an endless, vicious cycle."

But options for the international community appear to be in short supply, as North Korea is already one of the most heavily sanctioned states on earth.

Tuesday's action appeared to have been timed for the run-up to February 16 anniversary celebrations of Kim Jong-il's birthday, as well as to achieved maximum international attention.

Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as Obama begins his second term.

Japanese Prime Minister Shinzo Abe is bedding down a new government and South Korea's new president, Park Geun-hye, prepares to take office on February 25.

China too is in the midst of a once-in-a-decade leadership transition to Xi Jinping, who takes office in March. Both Abe and Xi are staunch nationalists.

The longer-term game plan from Pyongyang may be to restart talks aimed at winning food and financial aid.

Its puny economy and small diplomatic reach mean the North struggles to win attention on the global stage - other than through nuclear tests and attacks on South Korea, last made in 2010.

"Now the next step for North Korea will be to offer talks... - any form to start up discussion again to bring things to their advantage," said Jeung Young-tae, senior research fellow at the Korea Institute for National Unification in Seoul.

(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau at the UNITED NATIONS; Frederik Dahl in VIENNA; Michael Martina in BEIJING; Editing by Nick Macfie)

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