Obama keeps faith in science and warns of cyber threats

Peter Aldhous, San Francisco bureau chief

"IT IS our unfinished task to restore the basic bargain that built this country - the idea that if you work hard and meet your responsibilities, you can get ahead."

In adopting the phrase "unfinished task" as a signature motif for his 2013 State of the Union address, President Barack Obama signalled a return to familiar themes. For those who care about investment in science, that was a reassuring message. 

The fight against global warming and the importance of technology to protect national security also got high billing. On the latter, Obama signaled that hacking skills, rather than kilotons, are increasingly a crucial currency, promising a new focus on combating cyberattacks - paralleled by negotiated cuts to the US nuclear arsenal. 

In a combative speech designed to counter Republican opponents who want to cut the budget deficit by curbing spending on Obama's priorities - including education and research - the President made the case for continued investment in innovation.

"Every dollar we invested to map the human genome returned $140 to our economy. Today, our scientists are mapping the human brain to unlock the answers to Alzheimer's; developing drugs to regenerate damaged organs; devising new material to make batteries ten times more powerful. Now is not the time to gut these job-creating investments in science and innovation. Now is the time to reach a level of research and development not seen since the height of the Space Race."

The estimate of a 140:1 return on investment in genomics comes from a 2011 study by the Battelle Memorial Institute in Columbus, Ohio. While the precise numbers from that analysis have been questioned, the importance of continued innovation to America's future economic competitiveness has been stressed in multiple reports, notably from the US National Academies. 

"Now our enemies are also seeking the ability to sabotage our power grid, our financial institutions, and our air traffic control systems. We cannot look back years from now and wonder why we did nothing in the face of real threats to our security and our economy."

Obama called on Congress to pass new legislation to counter threats from hackers backed by hostile governments. That won't be easy: last year, a bill that would have demanded that companies meet minimum standards for cybersecurity, and report if they are attacked, foundered amid complaints that it would impose large costs on US businesses. 

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16 gunmen killed in Thai military base attack: army

NARATHIWAT, Thailand: In one of the most deadly attacks in Thailand's long-running insurgency, scores of heavily-armed gunmen stormed a southern army base on Wednesday, leaving 16 militants dead, authorities said.

In the unusually brazen early-morning assault, 100 militants, dressed in army fatigues and armed with AK47 and M16 assault rifles, attacked the unit in Narathiwat province, unit commander Captain Somkiat Pholprayoon said.

"Sixteen militants were confirmed dead after the attack," he told reporters at the scene, adding that the military and police were in "hot pursuit" of the 60 to 70 militants who fled the base after the attack.

The government expressed sorrow over the deaths, one of the highest single death tolls in some eight years of violence in Thailand's deep south, but praised the military operation, saying the army have had no choice.

"The government has no policy of using violence to deal with southern unrest but in this incident (militants) attacked the military base," Deputy Prime Minister Chalerm Yubamrung told reporters in Bangkok.

A shadowy insurgency has been fighting for greater autonomy for the country's southernmost provinces since 2004, with shootings and bombings occurring on a near-daily basis.

More than 5,500 people have been killed, both Buddhist and Muslim, in the bloody conflict.

Chalerm, who heads the government's special body in charge of the southern unrest, recently proposed imposing a curfew in certain areas of the most affected provinces.

"If we impose a curfew, then militants will find it more difficult to enter the area," he said on Wednesday.

Religious leaders oppose the move, saying it will do nothing to solve the underlying problems. The Thai cabinet is set to discuss the proposal on Friday.

Critics accuse the government of failing to address the grievances of Thailand's Malay Muslim minority, including alleged abuses by the military and a perceived lack of respect for their ethnic identity, language and religion.

Members of Thailand's security forces are frequently targeted in ambushes and roadside bombs, but organised attacks on military bases are relatively rare.

No military casualties were reported in the early hours assault at the base in the Bacho district of Narathiwat province, one of three Muslim-dominated provinces near the border with Malaysia. An army spokesman had earlier put the militants' death toll at 17.

"We learned of the attack in advance from defected militants," Colonel Pramote Promin, southern army spokesman told Thai television.

He added that a key local leader of the fighters, who wore bulletproof vests during the attack, had been killed in the clashes.

Southern army commander Lieutenant General Udomchai Thammasarorat called for local villagers to stay in their homes for 24-hours, for their "safety and to prevent any confusion during the pursuit of militants", he told broadcaster Thai PBS.

A report by the International Crisis Group on the violence in December said insurgents had grown "bolder and stronger" amid political inaction from successive Bangkok governments.

The attack on Wednesday is "part of a trend" towards bigger, bolder attacks by militants showing a new "willingness on the part of militants to engage the security forces head on," said Matthew Wheeler, an ICG South East Asia analyst.

"The fact that so many militants were killed is very unusual," he said, adding the last time there was such a high death toll was in April 2004.

The ICG report recommended a greater push towards decentralisation and closer engagement with local civil society groups and peace negotiations with insurgents.

It added that the deployment of 60,000 security forces and an emergency decree "have not achieved any appreciable decline in casualties".

- AFP/al

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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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Charred Human Remains Found in Burned Cabin

Investigators have located charred human remains in the burned out cabin where they believe suspected cop killer and ex-LAPD officer Christopher Dorner was holed up as the structure burned to the ground, police said.

The human remains were found within the debris of the burned cabin and identification will be attempted through forensic means, the San Bernardino County Sheriff-Coroner Department said in a press release early this morning.

Dorner barricaded himself in the cabin in the San Bernardino Mountains near Big Bear Tuesday afternoon after engaging in a gunfight with police, killing one officer and injuring another, the San Bernardino County Sheriff's Department said.

Cindy Bachman, spokeswoman for the San Bernardino County Sheriff's Department, which is the lead agency in the action, said Tuesday night investigators would remain at the site all night.

FULL COVERAGE: Christopher Dorner Manhunt

When Bachman was asked if police thought Dorner was in still in the burning cabin, she said, "Right… We believe that the person that barricaded himself inside the cabin engaged in gunfire with our deputies and other law enforcement officers is still inside there, even though the building burned."

Bachman spoke shortly after the Los Angeles Police Department denied earlier reports that a body was found in the cabin, contradicting what law enforcement sources told ABC News and other news organizations.

Christopher Dorner Manhunt: Police Exchange Fire With Possible Suspect Watch Video

Fugitive Ex-Cop Believed Barricaded in Cabin, California Cops Say Watch Video

Police around the cabin told ABC News they saw Dorner enter but never leave the building as it was consumed by flames, creating a billowing column of black smoke seen for miles.

A press conference is scheduled for later today in San Bernardino.

One sheriff's deputy was killed in a shootout with Dorner earlier Tuesday afternoon, believed to be his fourth and victim after killing an LAPD officer and two other people this month, including the daughter of a former police captain, and promising to kill many more in an online manifesto.

PHOTOS: Former LAPD Officer Suspected in Shootings

Cops said they heard a single gunshot go off from inside the cabin just as they began to see smoke and fire. Later they heard the sound of more gunshots, the sound of ammunition being ignited by the heat of the blaze, law enforcement officials said.

Police did not enter the building, but exchanged fire with Dorner and shot tear gas into the building.

One of the largest dragnets in recent history, which led police to follow clues across the West and into Mexico, apparently ended just miles from where Dorner's trail went cold last week.

Police got a break at 12:20 p.m. PT, when they received a 911 call that a suspect resembling Dorner had broken into a home in the Big Bear area, taken two hostages and stolen a car.

The two hostages, who were tied up by Dorner but later escaped, were evaluated by paramedics and were determined to be uninjured.

Rick Heltebrake told ABC News Radio that Dorner had "a big rifle" when he stole his truck.

"[Dorner] said I don't want to hurt you just get out and start walking up the road and take your dog with you. He was calm. I was calm. I would say I was in fear for my life but there was no panic.

Officials say Dorner crashed the stolen vehicle and fled on foot to the cabin where he barricaded himself and exchanged fire with deputies from the San Bernardino Sheriff's Office and state Fish and Game officers.

Two deputies were wounded in the firefight and airlifted to a nearby hospital, where one died, police said. The second deputy was in surgery and was expected to survive, police said.

Police sealed all the roads into the area, preventing cars from entering the area and searching all of those on the way out. Are schools were briefly placed on lockdown.

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Arctic sunshine cranks up threat from greenhouse gases

IT'S a solar double whammy. Not only does sunlight melt Arctic ice, but it also speeds up the conversion of frozen organic matter into carbon dioxide.

The amount of carbon in dead vegetation preserved in the far northern permafrost is estimated to be twice what the atmosphere holds as CO₂. Global warming could allow this plant matter to decompose, releasing either CO₂ or methane – both greenhouse gases. The extent of the risk remains uncertain because the release mechanisms are not clear.

Rose Cory at the University of North Carolina at Chapel Hill and her colleagues analysed water from ponds forming on melting permafrost at 27 sites across the Arctic. They found that the amount of CO₂ released was 40 per cent higher when the water was exposed to ultraviolet light than when kept dark. This is because UV light, a component of sunlight, raises the respiration rate of soil bacteria and fungi, amplifying the amount of organic matter they break down and the amount of CO₂ released.

The thawing Arctic is emerging as a potentially major source of positive feedback that could accelerate global warming beyond existing projections. "Our task now is to quantify how fast this previously frozen carbon may be converted to CO₂, so that models can include the process," Cory says.

Journal reference: PNAS, DOI: 10.1073/pnas.1214104110.

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Catholic Church in S'pore surprised by Pope Benedict XVI's sudden resignation

SINGAPORE: The Catholic Church in Singapore is reeling from the news of Pope Benedict XVI's sudden resignation. The 85-year-old pontiff announced on Monday that he will step down on February 28, and cited age as the main factor for his decision.

Pope Benedict XVI is the first pontiff to resign in centuries, and Catholics in Singapore are still trying to come to terms with this break in tradition.

"I'm really surprised because normally Popes, they live and do their duties until God calls them back home," said a local Catholic.

The news also shocked the head of Singapore's Catholic Church, Archbishop Nicholas Chia.

He said: "Well, we're all very surprised by the announcement by Pope Benedict XVI about his resignation. We never expected it. But definitely he has been thinking about it, and with such serious reasons, he is taking the step."

Calling the outgoing Pope a brilliant man and a great academic, Archbishop Chia said he has also made great contributions to the Catholic Church.

"We're all very grateful to him for all he has done during his pontificate since 2005, and contributing so much to the church. We are sorry to lose him. But at the same time, we know that it is for the good of the church, for the future. So we pray for him," added Archbishop Chia.

Church leaders in Singapore said the Pope's resignation shows great humility.

Eugene Vaz, the Vicar-General of the Catholic Archdiocese of Singapore, said: "I think (this is an) encouraging note to all Catholics in Singapore. An inspirational moment also... We've got a leader who's really caring. Not just for himself but for the Church, and ready to take the steps to make sure that the Church would move on, continue being relevant.

"As he himself says, at his age, he finds it difficult to keep pace with the quick changes that are taking place in the world. So you need somebody who would be more adept to that. And he feels his time is over."

Monsignor Vaz added that the Pope will be remembered for his strong leadership and as a champion of Catholic tradition.

-CNA/ac

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North Korea says it conducted third nuclear test

STORY HIGHLIGHTS

• NEW: The test is "a significant step forward" for the North's program, an analysts says


• Obama calls the test "highly provocative," calls for "swift" international action


• North Korea confirms it carried out a more powerful test


• It says it used a smaller, lighter bomb than in previous tests

Hong Kong (CNN) -- North Korea said Tuesday that it had conducted a new, more powerful underground nuclear test using more sophisticated technology, jolting the already fragile security situation in Northeast Asia and drawing condemnation from around the globe.

It is the first nuclear test carried out under the North's young leader, Kim Jong Un, who appears to be sticking closely to his father's policy of building up the isolated state's military deterrent to keep its foes at bay, shrugging off the resulting international condemnation and sanctions.

It also provided a provocative reminder of a seemingly intractable foreign policy challenge for President Barack Obama ahead of his State of the Union address later Tuesday.

"The test was carried out as part of practical measures of counteraction to defend the country's security and sovereignty in the face of the ferocious hostile act of the U.S.," the North's state-run Korean Central News Agency (KCNA) said, referring to new U.S.-led sanctions on Pyongyang in the wake of a recent long-range rocket launch.

The nuclear test Tuesday, which follows previous detonations by the North in 2006 and 2009, had greater explosive force and involved the use of a smaller, lighter device, KCNA reported.

North Korea's nuclear program is shrouded in secrecy, so it's almost impossible to independently verify many of the details of the test. But its claims play into fears among the United States and its allies that Pyongyang is moving closer to the kind of miniaturized nuclear device that it can mount on a long-range missile.

Despite the North's claims of progress Tuesday, analysts say they believe it is still years away from having the technology to deliver a nuclear warhead on a missile.

"This test isn't going to do that in and of itself, but it is a significant step forward," said Mike Chinoy, a senior follow at the University of Southern California's U.S.-China Institute.

Condemnation from world leaders

After Pyongyang confirmed it had gone ahead with the test in defiance of international pressure, world leaders responded with condemnation.

"This is a highly provocative act" that threatens regional stability, breaches U.N. resolutions and increases the risk of proliferation, Obama said in a statement.

"North Korea's nuclear weapons and ballistic missile programs constitute a threat to U.S. national security and to international peace and security," he said. "The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region."

Obama called for "further swift and credible action by the international community" in response to Pyongyang's actions.

"It is a clear and grave violation of the relevant Security Council resolutions," the office of Ban Ki-moon, the secretary-general of the United Nations, said in a statement referring to the test.

The United Nations Security Council will meet in New York on Tuesday morning to discuss the development, a security council diplomat said, declining to be identified because of U.N. protocol on such matters.

Japanese Prime Minister Shinzo Abe said the test was "extremely regrettable," adding that Tokyo would "strongly" protest it.

Seismic activity

U.S. seismologists reported a disturbance on Tuesday morning in North Korea centered near the site of the secretive regime's two previous atomic blasts.

The area around thepicenter of the tremor in northeastern North Korea has little or no history of earthquakes or natural seismic hazards, according to U.S. Geological Survey maps.

The disturbance reported Tuesday had a magnitude of 5.1 -- upgraded from an initial estimate of 4.9 -- took place at a depth of about 1 kilometer, the USGS said.

Kim Min-seok, a spokesman for the South Korean defense ministry, said the magnitude of the "artificial tremor" suggested the size of the blast could be in the order of 6 to 7 kilotons, more powerful than the North's two prior nuclear tests.

That calculation, though, was based on the USGS's initial estimate of a 4.9-magnitude seismic disturbance, he said. A 5.1-magnitude tremor could indicate a 10 kiloton explosion.

The China Earthquake Network Center said on its website that the seismic disturbance in North Korea was a "suspected explosion."

News breaks at a quiet time in Asia

The test took place at a time when several East Asian countries, including China, North Korea's major ally, are observing public holidays for the Lunar New Year, which began Sunday.

It also comes ahead of the birthday on Saturday of Kim Jong Il, the former North Korean leader who died in December 2011 and was succeeded by his son, Kim Jong Un.

North Korea announced last month that it was planning a new nuclear test and more long-range rocket launches, all of which it said were part of a new phase of confrontation with the United States.

It made the threats two days after the United Nations Security Council had approved the broadening of sanctions on the reclusive, Stalinist regime in response to the North's launching of a long-range rocket in December that succeeded in putting a satellite in orbit.

Pyongyang said it carried out the launch for peaceful purposes, but it was widely considered to be a test of ballistic missile technology.

U.S. analysts say North Korea's first bomb test, in October 2006, produced an explosive yield at less than 1 kiloton (1,000 tons) of TNT. A second test in May 2009 is believed to have been about two kilotons, National Intelligence Director James Clapper told a Senate committee in 2012.

By comparison, the bomb the United States dropped on Hiroshima in 1945 was a 15-kiloton device.

In May 2012, North Korea said it had amended its constitution to formally proclaim itself a "nuclear state."

CNN's Jethro Mullen reported and wrote from Hong Kong. CNN's K.J. Kwon in Seoul, South Korea; Yoko Wakatsuki and Junko Ogura in Tokyo; Judy Kwon in Hong Kong; Dana Ford and Matt Smith in Atlanta, Georgia; Anna Maja Rappard in New York; and Elise Labott in Washington contributed to this report. Journalists Katie Hunt in Hong Kong and Connie Young in Beijing also contributed reporting.

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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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