>> hi. we want to welcome in viewers in the united states and around the world. north korea said it conducted a test of a hydrogen bomb just a few hours ago. a new photograph showing kim jong un signing the order to

carry out the test. the official news agency said it went perfectly. japan sent aircraft to figure ute if there is radioactive material. let's go to paula hancox in seoul, south korea with more on this. what do we know from the north koreans and what do we know about the south korean reaction. >> in just the last few minutes, we had reaction strongly condemning this nuclear test. she said it's clearly a provocation and it's threatening people's lives and safety. she said south korea has continuously warned north korea would pay a price if they carried out a nuclear test and said there's now a need for a

strong international response against north korea. i've also heard from japan's prime minister shinzo abe who said it's a threat to japan's security. he says he condemns it and cannot tolerate such a nuclear test. we can see this condemnation from the regional powers and across the world starting to flood in. this time around, north korea claims it's a hydrogen test, a more powerful test than the previous tests it carried out before. if that's the case, senior u.s. administration officials say it could be days before they can confirm that or not. >> clearly the north koreans are delighted by this. the news coming to the world via state-controlled media.

and also interestingly, putting out those images of leader kim jong-un signing the order for the test to be carried out. a. >> the power of these photos, quick response. they issued the order for this to be carried out. it was january 3, a few days ago, he physically signed that order. those are the photowes ear seeing and the handwritten note that he is signing to say yes, this will go ahead. it was 10:00 a.m. local time that they carried out the nuclear test and then just 2 1/2 hours later they

had the official announcement. they said it was justification they used many times in the past to carry out a test like this. john? >> paula, thank you. live in seoul with the breaking news coverage. now earlier, the south korean foreign ministry convened an emergency mission. they say the administration is currently under emergency and collaborating with related organizations. japan issued a similar condemnation. abe reiterated south korean's comments saying it's a serious challenge to nonproliferation efforts. >> north korea's nuclear tests is a serious threat to our

nation's security and absolutely cannot be tolerated. we strongly denounce it. >> thoo latest test could change the fundamental situation over north korea's nuclear program. what does that mean? >> it's certainly going to have an impact in japan where abe's efforts to strengthen japan's own military capability will probably gather steam. and it's going to more broadly plo voek a big debate how to best respond to this. the predictable pattern based on what we've seen after the other

three nuclear tests is they there will be condemnation at the united nations, there will be the imp position of some additional sanctions, but nothing really will change. because the sanctions are not going to be tough enough to really force a change in north korean behavior. it's going to sour the north's relations with china and also going to sharten the debate about whether some kind of diplomacy where you hold your nose and try to deal with the north offers perhaps a better route to slowing down the acceleration of the north's nuclear program. i think this is a demonstration that the north koreans really

don't care what the chinese think. it's a real slap in the face for china. beijing in recent months had modified an approach that we've seen in the last couple of years in which relations had chilled. but in the past several months, chinese sent a senior officials to north korea. before they would encourage the north not to engage in provocative acts. it's a personal affront to the chinese leader. beijing will no doubt be furious. but at the end of the day, are they willing to take the kind of steps to force it to abandon its pursuit of enhanced nuclear capability. i very much doubt that.

>> i know you're not a nuclear scientist, but i wonder if you can explain the difference here between a plu etotonium explosi and a hydrogen explosion and why this is so significant. >> well, i'm not a nuclear physicist, but a hydrogen explosion is much more powerful. it gives you a much more powerful weapon. there's some doubt it's clear that's the direction they're going. so that's worrying. and it's particularly worrying in the context of the north's development of a long-range missile capability. north koreans have this mobile missile called the kno 8 something the american military calls it shoot and scoot. you can hide it in a cave where it's not visible, bring it out, fire the missile with a warhead on it, and then hide it again before anybody can retaliate and attack it.

and each time the north koreans stage a nuclear test, whether this was a full-fledged hydrogen device or not, it enhances their capability, it enhances their technical knowledge. and it's one further step towards the eventual goal of miniaturizing a warhead that they can place on a missile. so in the broader security sense, this is potentially a very worrying development because if north continues in this direction, they will eventually have a miniaturized warhead that can be placed on a missile that could reach the united states. and certainly targets in the ree. >> very quickly, if they had developed hydrogen bomb, is it at a point of being a game changer? or not there yet. >> it's conceivablconceivable, be a game changer. but even so, the options are very, very difficult. no one wants to go to war with north korea. but sanctions don't work and negotiations have not been successful and the u.s. is very

uneasy getting back into them. so no options are good here. there's no good choices. >> this is not the first time north korea has conducted nuclear tests. our next guest spoke with nuclear scientists who insisted they work. >> august 1998, speem leader kim jong un is just 15 years old when his father, the leader kim jong il fires a multistage rocket over japan, demonstrating north korea's frightening potential to develop rockets that reach around the region.

>> north korea claims nukes is its only lifeline to defend itself against the u.s. which it says is hell bent on toppling pyongyang. december 2012, in spite of u.n. resolutions condemning rocket launches, north korea fires what it calls a peaceful satellite into space. increased sanctions stoke the north's anger further. state media announcing a third nuclear test in february 2013. with each test, north korea gains valuable new knowledge. in may, another bombshell. north korea claiming it has miniaturized nuclear weapons. warheads small enough to put on a missile. >> i think the situation is very dangerous. there's no constraints on this in program.

>> north korea seems determined to build up its arsenal. the facility has an underground rail line, movable building and a kor over the launch pad. all designed to hide activity from prying eyes in the sky. but north korean space scient t scientists we met in december told us their purpose is peaceful. our launch is no threat to the u.s., said this researcher, speaking to us outside of pyongyang's new satellite control center. >> what can you say to the world to prove that this is not a ballistic missile program in disguise? why on earth would we have any intention trying to drop nuclear bombs on the people of the world, including the united states, said the director of scientific research and development. but they boast a growing arsenal and a willingness to strike if

provoked. this latest escalation leaves many wondering just how far is north korea and its unpredictable young leader willing to go. will ripley, cnn. >> and that is a good question. with that, we'll bring in jasper kim, the director of the center of korea. he's on the line from seoul. that's a question that will posed in his report, how far is kim jong un prepared to go. what does he want and why would he do this now? >> well, from his impressive, i mean, looking at the world from his perspective, he wants power, prestigious and respect. how does he get that? he gets it through things like this, nuclear tests, provocations, and the world paying attention to him and his regime. that's exactly what he's getting. he's pushing it further and

further as each year goes on. >> clearly this is a military test, a nuclear blast that has nuclear purposes. what does this say about the die national ecks of the regime in pyongyang. >> well, no one really knows exactly. but it could be very good. or it could be very bad. very good in the sense that we have control over the nuclear technology. we're using this for peaceful purposes and displaying it, trying to be transparent. but more likely it's something that's kind of a risk to the international community. it is going to put everyone in a level of tight concern. that's going to make everyone nervous. he's trying to get attention the last year of the barack obama administration.

>> i'm also wondering about what it says if anything about the recent purging of dozens of high-ranking north korean officials. and also that mysterious death of another north korean official who's responsible for contact with the south koreans. is any of this linked together? >> yeah. i mean, there could be a linkage. what we see are patterns. and maybe not one singular event is that alarming. but in a state where nothing is shocking, patterns can be very concerning. and we see basically kim jong-un pruning his power base. and that means that there could be possible risks or insurrection against his leadership. or it could be nothing. we're not quite sure. but what we're sure is the end result of all of that. maybe it's paranoia based on nothing. but north korea is on a determined arc towards establishing nuclear weapon capabilities. so i think the question now is not whether it has done so, but what does the world look like

now that north korea, we assume, has nuclear mill tarization capabilities. how does the world function and react to north korea in that type of world? >> that's a question they'll be looking at at the u.n. in the coming hours. governments around the world will be dealing with in days anticipate weeks to come. jasper, thank you on the line from seoul. appreciate it. next here on cnn news room, fed up, the u.s. president barack obama gets emotional as he lays out executive actions he's taking to curb gun violence. >> every time i think about those kids it gets me mad. tucson. blew an amp.but good nights. sure,music's why we do this,but it's still our business. we spend days booking gigs, then we've gotta put in the miles to get there.

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>> kim jong-un signing the order for a hydrogen bomb test. if it's verified it could be a significant military advancement for north korea.

the u.s. says it may take days to confirm the claim. the united nations security council is holding an emergency meeting in new york just a few hours from now. we're being continuously warning that we're it will pay a price for conducting a nuclear test. it's important to bring out a stern message with the security council, the international community, the u.s. and our allies. president obama insisted preventing even one gun death is important. he tightened gun controls that he said are long overdue. jim acosta has the details.

>> president obama embraced the crowd of families of shooting victims on hand. >> from first graders to newtown -- >> the president wiped away tears as he described as his saddest day in office, the slaughter of 20 first graders and six adults in the sandy hook school shooting. >> every time i think about those kids, it gets me mad. and by the way, it happens on the streets of chicago every day. >> and a warning to all southeasterlies to conduct background checks or face prosecution. more money for mental health care and a new push for smart technology.

he was joined by the father of daniel barton who died at sandy hook. >> as a nation we have to do better. we are better. we are better than this. >> this is not a community that people want to belong to. just leave it at that. you don't want to be invited into that club. >> the new executive action stopped short of mandating uniform background checks across the country. the president blamed nra and the republicans in congress for that. >> the gun lobby may be holding congress hostage right now, but they're not going to hold america hostage. >> speaker paul ryan said rather than focus on criminals and

terrorists, the president goes after the most law abiding of citizens. his words and actions amount to a form of intimidation that undermines liberty. >> he's obsessed with burdening law abiding citizens who are going to follow the law no matter what it is. >> i believe in the second amendment. it's there written on the paper. it guarantees the right to bear arms. no matter how many times people try to twist my words around, congress spending money to hire new investigators at the atf and fbi. republicans have long said the president should enforce the nation's existing gun laws and the white house is saying those lawmakers have a chance to do just that. jim acosta, cnn, the white house. >> for days now, republican and

u.s. presidential candidate donald trump has been warning that mr. obama wants to take away their firearms, something the president denies. but many of trump's supporters say they do believe obama is plotting to strip away their constitutional rights. randi kaye spoke with them in new hampshire. >> there's an assault on the second amendment. you know, obama is going to do an executive order and really knock the hell out of it. >> when donald trump tells supporters he's attacking their second amendments and he's going to take away their gups, they believe them. >> do you think that obama is coming after your guns? >> i believe that's his main objective, yes. >> do you believe the president is taking away your guns? >> no. >> you don't believe him when he says he's not coming after your guns? >> i don't believe that one bit. >> reporter: we taught up with these trump supporters, many of them gun owners just hours after the president laid out his new requirements for gun sellers and buyers, which include expanded background checks.

>> anyone who can legally buy a gun now will still be able to legally buy a gun. so what's the problem with greater background checks? >> i think you just made the case, if you think about it, if they're already covered, why not make another regulation to say what's being said. bad guys are going to get control of guns because they're going to do what's legal. all it's doing is punishing good people for what bad people do? >> and despite the president says this to calm fears -- >> this is not a plot to take away everybody's guns. >> reporter: many we spoke with here are considering buying up guns before the laws get any tougher, like this woman. >> i think if you try to take away our guns that he's basically breaking the law. it's our second amendment right. and we have every right to protect ourselves. a and. >> reporter: and while we found a few in the crowd who don't mind the tougher background check, that i still don't believe it will make any difference. >> what would really make america safe? taking the guns away from the

criminals. i'm not the problem. i'm a good guy with a gun, not the bad guy with the gun. >> but wouldn't extra controls do that? >> wouldn't it be great if they enforce the laws currently on the books. >> 30,000 people a year die of gun violence. what's the answer? >> i don't believe making more laws to make it harder to get guns is going to do that. like i said, if the criminals are out there that want guns they're going to get them one way or another. >> trump's supporters are confident if he makes it to the oval office, one strike with a pen and mr. obama's gun regulations are history. >> trump is right we need to address the problems of people making bad decisions and understand that guns are just a tool. as americans, we should have the rights to all the tools we want, including guns. >> randi kaye, cnn, claremont, new hampshire. >> please join cnn for a special look at guns in america with u.s. president barack obama. anderson cooper hosts an exclusive one hour live town hall event thursday night 8:00 in washington.

that's 1:00 a.m. friday in london. and 9:00 friday morning in hong ko kong. we will continue with breaking news. north korea said it's carried out an understood ground nuclear test. we'll tell you how the u.s. is reacting to pyongyang's latest move. if you had a dollar for every dollar car insurance companies say they'll save you by switching, you'd have like a ton of dollars. but how are they saving you those dollars? a lot of companies might answer "um..." or "no comment". then there's esurance - born online, raised by technology and majors in efficiency. so whatever they save, you save: hassle, time, paper work, hair tearing out and, yes, especially dollars. that's auto and home insurance for the modern world. esurance. backed by allstate. click or call.

>> welcome back. i'm john vause with barack obama teared up as he dezriebed the bold steps he's taking to stop

deadly gun violence. vournded by the families of the victims, the president blasted the lack of progress. now he's taking executive action calling if more extensive background checks, increased mental health treatment and improved gun safety technology. our other major story this hour, north korea said it's carried out a successful test of a hydrogen nuclear bomb. new pictures show kim jong-un signing the order to carry out the test. a senior u.s. official says it could take days to determine if the understood ground test was successful. north korea has hes tested plutonium nuclear devices three times in the past. let's go to paula hancox in seoul, south korea with more. it's been about six hours now since word came through that this hiez mick activity had occurred in the region.

>> they say it was a successful hydrogen bomb test. we don't know for sure if it was, in fact, hydrogen. at least the first two of the three tests were plutonium. the 2013 one. it was not known if it was uranium and plutonium. there are differences of opinions on that. but if this is a hydro general test, it would be a significant jump in capability for north korea. they have published a photo of him signing the order. and also a handwritten statement that he had signed to issue the order for this. and we have been hear international condemnation already flooding in from the region, from south korea, from japan, from the united kingdom. we also know, we just heard right now in the past couple of minutes, a meeting is underkay between the south korean foreign

ministry, between the u.s. ambassador to south korea, and also the commander of the u.s. forces here in korea. so they will be discussing what has happened. remember, there are close to 30,000 u.s. troops here in south korea. south korea defense ministry saying they are on a high state of alert. john? >> more from the breaking news in the korean peninsula. thank you. we cannot confirm these claims at this time, we condemn any violation of the unfc resolutions and again call on north korea to abide by its international obligations and commitments. the statement went on, we will continue to protect and defend our allies in the region, including the republic of korea, which is south korea, and will respond appropriately to any and all north korean provocations.

we would like to bring in phillip yuung now. phillip, again, thank you for joining us. there is no independent verification of the north korean claims. we have the u.s. geological survey and others detecting the 5.1 tremor which is a seismic event. we have the claim by the north koreans. so with that in mind, though, let's talk about what the hydroghydr hydrobomb can do. what sort of damage in terms of weapon, if you like, is a hydrogen bomb cared to a nuclear weapon. >> the one dropped in nagasaki was 15 to 20 kilotons. the first test was something on the scale of 100,000 kilotons.

so we're talking about a significant jump in capability. i have to note, though, that a lot of speculation at this point is that north korea probably hasn't done a full fledged hydrogen bomb. there's more than likely, they have the capability to do a conventional atomic weapon, or fission explosion that was boosted by some kind of fusion material. so it sort of added on to boost the actual explosion. we're going to have to find out what actually occurred. >> north korea is probably the most heavily sanctioned coin friday in the world. where will they get the resources if they have, in fact, developed an h-bomb? >> they had the know thf how for quite a bit of time. it's all brain power. and north koreans proved capable with very little resources to put a satellite up in the air, to build a nuclear device.

they demonstrated a political will, despite condemnation that's going to occur to create a sophisticated nuclear weapons arsenal. this is what i think ultimately has a potential to be a game changer. >> the statement coming from the north koreans, they don't say they developed an h-bomb, they also talk about miniaturizing a hydrogen bomb. how significant is that? >> that could be. >> they have to be able to miniaturize, which is a significant technological feat. but what that means is they can basically put on top of a missile a long-range missile that has a capabability of hittg places as far as the united stat states. i still think that's a little ways away, but that is their aim. they have an incredible amount of data to be able to continue

that request. >> the kickoff to the u.s. primary season gets under way. political attacks get under way. we'll have the latest from the presidential campaigns when we come back. do you know the secret to a happy home in these modern times?

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>> pyongyang said it conduct ed conducted a test of a hydrogen bomb. north korea opens the year with the exciting noise of the first hydrogen bomb. if the test is legitimate, it would be considered a significant advancement over north korea's three previous tests of plutonium nuclear

devices. >> the speaks by the candidates are taking a bit of a sharper tone. sara murray has details from the republican side. . >> i don't care if your name is barack obama, ted cruz or marco rubio, you never want to think of a consequence in your life. >> months of raising money, honing policy positions and stump speeches, coming down to this. the last few weeks before voters take the polls. and now the knives are out. on the stump and on the airwaves. >> they go to the legislature, schedule when you're supposed to be there, tell you where to sit

and then say yes or no. senator rubio can't even seem to get that going. >> marco rubio tries to turn one of his potential weakness in the gop, immigration, into a shot at ted cruz. >> he supported a massive expansion of temporary workers, guest workers coming into the united states. he supports a massive doubling of the number of green cards. so his record is a little different than what it is now. >> and donald trump is sticking to one of his favorite punching bags, jeb bush. >> how would you like to spend $59 million? stand up. if i spent $59 million on him, he would be at at least 5. okay? >> all those millions of dollars, coming straight to the homes of early state voters as candidates blanket the airwaves with ads. a super pac backing rubio,

slamming christie as too cozy with barack obama and his liberal print pls. >> chris christie could well be obama's favorite republican governor. why? christie's record. >> while cruz tries to rally voters over the threat of illegal immigration. >> i understand that when mainstream media covers immigration, it doesn't often see it as an economic issue. but i can tell you, it is a very personal economic issue. >> vowing to secure the border -- >> if i'm elected president, we will triple the border patrol. we will build a wall that works. >> reporter: and using some language that sounds awfully familiar to trump. >> we says we're going to build a wall. here's a good thing, he's a politician so he wouldn't know where to start. i know how to to the build a wall, okay? i know the footings. i know how deep they have to go.

i know how high with the precost. >> trump telling "the washington post" since ted cruz was born in canada it could be a problem for the republican bob. this could be the beagaining of a political feud bubbling up between trump and cruz who are in a neck to neck race in iowa. sara murray, cnn, fairmont, new hampshire. >> my opponent said she told banker, quote, unquote, cut it out. and end the destructive behavior. establishment politicians are the ones who need to cut it out. >> with respect to my opponent,

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>> north korea says it's conducted a successful nuclear test. kim jong-un signing the order to carry out that test. it's the country's fourth underground test since 2006, but the first using more powerful hydrogen instead of plutonium.

the south korean foreign ministry called on the united nations to take action. >> as we all know, north korea's provocation is a complete violation of security council resolutions and a serious challenge to world peace and security. >> well, the fbi is asking for help in tracking the movements of the san bernardino terrorists. they put together a nearly four-hour long time line of last night's massacre, but there's an 1-minute missing gap when authorities don't know where farook and malik were. >> we want to make sure we know whether or not they stopped at any locations, any residensider any businesses that we don't already know about. we want to make sure if they made contact with anyone that we don't already know about between that time, that we're able to fully investigate those matters.

the fbi says the missing information could help determine the motive for the massacre which left 14 people dead. to oregon now where armed proteste protesters say they're not backing down, at least for now. the group is upset over land they claim the federal government is illegally taking. >> reporter: authorities say the armed protesters at the national wildlife refuge need to leave. but the protesters say they're not going anywhere. can you give us some sense of exactly how long you might be here? >> this is a lot of work. definitely it's going to take some months. >> months that some local residents in burn, oregon, worry cowl turn into much longer. >> i feel like they lied to us. i feel like the whole protest march was a ruse so that they could do what they're doing

right now. >> there are some people that aren't ranchers who are saying they came into our community and took over. this is our community. why are they coming from outside into our community? >> i understand that concern. >> reporter: the group that now call themselves the citizens for constitutional freedom is still here. it's now day four. we don't see any local, state or federal police out here. and it is in the middle of nowhere. we're about 35 miles from the closest town. the lack of police presence is a stark contrast to the deadly siege and confrontation at ruby ridge in idaho that left three dead, including a u.s. marshal in 1992. less than a year later, there was the deadly raid in waco, texas, that left at least 75 people dead, including women and children, and four federal agents. the word waco comes up quite often when they start hearing words like takeover. are you worried this is going to end that way? >> no. nope. america isn't going to tolerate another waco. >> but you're the only ones here. america is at home.

>> yeah, well, there's a neat quote from world war ii that said we can't do that because there will be a rifle behind every blade of grass. >> the armed group said the federal government is illegally grabbing land and they want to give it back to local ranchers and farmers. >> i think it's time for people to be talking about these issues. i think that they can do it in a nonviolent way, that could be worthwhile. >> the group's leader comes from a long line of mormons, but in a statement, the mormon church said they are deeply troubled by the reports that those who seize the facility suggest that they are doing so based on scriptural principles. this occupation can no way be justified on a scrip churl

basis. >> and there is an interesting footnote to this story, the leader of the group who has a reputation for battling the government has financially benefited from a federal loan. but almon bundy denies being a hypocrite for taking the money. >> there's a role. all the government's roles are for the people, for the individual. so whenever those governments step out, then that's when we step in. and that's what we're doing. >> so what do you say to a critic who say that's hypocrisy, you taking a small business loan from a federal government? >> i believe there's roles that the federal government plays, right? and that was an sba loan and i took that loan. and that was an effort in assisting the people in using their rights. >> public records indicate that in 2010, bundy borrowed $530,000 from the u.s. government for his

truck maintenance company in arizona. you've been watching cnn live from los angeles. i'm john vause. a lot more on our breaking news about north korea's underground nuclear test with rosemary church and errol barnett after a short break. "ow..." "are you okay?" "yeah, i just got charged for my credit monitoring. that's how i know it"s working." "ah. you know you can go on creditkarma.com and check

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record this. voila. remotes, come out from the cushions, you are back. the x1 voice remote is here. neighbors with claims it tested a hiydrogen bomb. an emotional moment for barack obama as he outlines his plans to curb gun violence in america. >> but his critics aren't listening. the reaction from republican presidential candidates and the national rifle association. hello and welcome to our viewers here in the united states and all around the world. i'm rosemary church. >> and i'm errol barnett. thanks for joining our two hour block. this is "cnn newsroom."