right. gravitational waves in space do exist. >> the stand off in oregon, today, the four remaining holdouts at the national wildlife refuge, with that, the anti-government protest was over about six weeks after it began on january 2nd. allen schauffler has been covering it from the start. and he joins us from burns, oregon. and allen, how are the people reacting? they have had meetings about this, and it's finally over, and is there a sense of relief? >> reporter: yeah, a considerable sense of relief, but also considerable anguish in this town. it has been a rough way to start the year for the people who live here in hardin county. when the protesters took over the wildlife refuge, they said that they were doing it in support of ranchers who had served prison terms, and management practices and called for the federal government to give back land to private landowners. they wanted that movement to spread to the entire west. it has been very difficult here in burns. the fbi and the town here, all of folks involved, still have a lot of work to do. on day 41, it finally ends. three of the last four occupiers surrendering first, leaving just one man behind. david frye, who is live stream videos and phone conversations have drawn thousands of relationships. >> i'm not a christian, i'm a mess aic judeist. and it's better to die with honor than to be forced to live dishonorably. that's what i'm doing, so you guys can address my grievances. >> periodically threatening to kill himself, or die confronting authorities, frye walked out early thursday morning. >> as many of you in the room know, he was live streaming and he was in a very emotional state. i have to believe that at a certain point, he was able to look around and notice that he was there by himself. and he removed himself from that situation. >> reporter: meanwhile, in portland, nevada rancher, cliveen bundy, whose two sons led the takeover, on his way here, he'll face federal charges stemming from a 2014 confrontation for refusing to pay cat grazing rights. emotions were mixed. jacob vincent was one of the flag waving supporters, searching for positives. >> no matter how long they're going to be locked up, in the end, it's going to be noticed. it's going to be inspiration for people all across the country. >> reporter: while julie wiekel, who lives a few miles from the takeover site, was ex static. >> i just posted hallelujah, and that says it all, i'm so glad this is over. >> reporter: it started january 2nd when the bundy brothers and perhaps 20 followers walked in and took over the several buildings here. the bundies and several others wrote arrested on february 26th, traveling to a meeting in another town. during that traffic stop, lavoy finicum was shot and killed. the arrest and the shooting scattered most of the group at the refuge. more arrests followed, and finally, just four held their ground for the last two weeks. >> we can't let these people trample on us, taking our guns. >> reporter: in the end, it did make julie weikle happy, but she said that it made her angry. >> that a small bunch of people with a broad assortment of gripes and complaints about a whole bunch of things in their lives can tear up a community in a way that i didn't think i could ever see, and that's exactly what has happened here. >> now, the fbi gives considerable credit to franklin graham, the evangelist. and nevada assemblywoman, michelle fiori, who kept in touch with the final four in the last hours to calm them down and greeted them when they walked out to meet the fbi agents today. this is a huge job now for the fbi, and their investigation begins at the massive crime scene, and the department of justice announced that there have been seven more arrests, and nine total indictments in six western states. that's probably the last of the folks there in the revenge that they have been thing to get under wraps. >> allen, has the fbi given an idea exactly what this investigation ahead of them will ensnail >> reporter: yeah, we got a quick briefing. there were agents out there right now checking to make sure that there was nobody in the buildings. there are about 15 buildings out there, and they had to bring out bomb technicians to make sure that nothing nasty was left behind, and computer experts to see if the computers were tampered with, and also, they're going to bring in a special team to see if any native american antiquities or sites were vandalized in any way. they have a lot of work to do out there, and they say it's going to be a couch of weeks at least. >> all right, allen schauffler, thank you. another day on wall street for a fifth straight day of losses. the dow closed down 250 points. and a globaldown, what is happening on wall street? >> reporter: what was concerning to investigators today? >> it's the same thing that has been concerning investors since the beginning of the year, michelle, bakely the slowdown of global growth, which is rooted in the slowdown in china, and the ripple effect of that, hammering commodity prices and low oil prices and fears of volume of global trade. and all of these are weighing on the markets, and now other fears coming onboard. a lot of central banks are engaging in stimulus measures or willingness to put forward stimulus measures, but there arer serious doubts over whether those measures are as effective as they once were. >> why is that? >> we have seen the bank of japan put interest rates into negative territory. charging banks to park their money in the bank of japan. the reason, they want to encourage them to loan the money out and it stimulate economic activity. and one of the benefits should be that it boosts prionses. right now, europe is under deflationary pressures, and japan is, and we're not seeing any letup in those deflationary pressures. and not seeing prices go up and that's a concern. a lot of that is tied to commodity prices. >> let's talk about oil now, the prices slid again, and trim loonses, and what's going on there? >> we're seeing this all this year. a report will come out and show that stockpiles are up and oil is up. there's an oversupply of oil, and then you get announcement like today, where opec signals its willingness to work with other producers. there are only two ways that prices will go up in oil, and that's if you see a massive increase in demand, which is unlikely, or you have to get all of the nationing to agree to cut output. and not only do you have to get opec countries on the same page, including saad audand iran, who are bitter enemies in the middle east. but you have to get non-opec producers like russia onboard. when you look at the fundamentals, there doesn't seem to be much in sight. >> what does this mean for someone at home looking at their 401k. >> the s&p, which is proxy for 401k is down 10%. and what you have is negative sentiment. bearish sentiment has really taken hold in the market. and the investors are looking at the downside. you saw this in energy stocks, for the fundamental reason that the oil prices are low. hammering shale oil producers, and one-third of them could go bankrupt before the end of the year because it's so unprofitable for them to keep producing oil. and now this year, moving to the financial being sector, because if the central banks around the world are moving into negative interest rates, and also over concerns over loans. so just a tremendous amount of bearish sentiment out there right now. >> thank you very much. in less than two hours, democrat candidates, hilliary clinton and bernie sanders will take to the stage for their latest presidential debate. this time in milwaukee, wisconsin, and the next primary is in just over a week. michael shure joins us from milwaukee. and so hilliary clinton picked up an endorsement from the congressional black caulk us, and how significant is that? >> well, it's significant because she didn't have 20 lose it to bernie sanders. any support that hilliary clinton is getting right now is important. and it's also significant because you know what's next on the calendar, michelle. south carolina has an almost 30% african-american population, and new hampshire has a 1% african-american population. because of that support and the way she has to tool her campaign now, it really does mean a lot. today, it was the political arm of the be congressional black caulk us, but today, big names in that caucus spoke out. one of them represents louisiana congressman cedric richard. >> what you have to tell young people, and i tell my young people, you can't just listen to what someone is telling you, because most of the time if it's too good to be true, it's too good to be true, and when you start saying free college, free healthcast, the only thing that you're leaving out is a free car and free home. but who is going to pay for it? and it's our responsibility, to let our young people know that we want you involved and we want your ideas. >> you see cedric with a lot of gray hair behind him. and you hear him say young people, young people, young people. and this is the focus of this effort on behalf of the clinton campaign. they came out to vote for president obama. >> so that's good news for hilliary clinton, but she did take some pretty tough hits in the iowa caulk uses and the new hampshire primary, and what does she need to do now? >> reporter: well, i think that she needs to be patient and focus on what's coming up. for example, south carolina is in february, and nevada is in february, and then the schedule gets really good for her. it's going to be a big march for her, and it has to be or otherwise, it's a big march home for her. you have to remember the fact that she has organizations throughout the south. bernie sanders did very well in iowa, in new hampshire new hampe has had a lot of time to campaign in those states. and it's infectious, and it's important to know that he has very little time to work in a lot of these states. it's not as long of a campaign since last summer until now in new hampshire. hilliary clinton has to be patient in her organization, and she has to be patient in what people in new hampshire told her. she has to address the women vote and she has to address the fact that bernie sanders is a revolution. >> the republicans, obviously, there were some shakeups, and people suspending campaigns after new hampshire and what's going on with them now? >> reporter: well, some interesting news. john kasich, and chris christie, and the cofounder of home depot, a big supporter of chris christie's, he has now moved to backing john kasich. and that's a lot of money. you heard bern ber wins big in new hampshire, raisings $5.2 million. and john kasich, an established candidate on the layup, and he gets the money, and jeb bush finishing fourth, kind of a disappointment. and kind of overshadowed, but still alive, and he's going to bring his brother, former president, george w. bush into south carolina, and his name is big there, campaigning with lindsey graham. so it's the democrattics' time to campaign once again. we're following breaking news concerning the syrian peace talks. john kerry and lavrov just announced an agreement for a ceasefire. and kerry hopes that it can be in place in a week. >> would have agreed to stop nationwide hostilities to begin in one week's time. it's ambitious, but everybody has agreed to try to achieve this. this will apply it all parties in syria with the h the exceptif the terrorist organizations -al nusra. >> he went on to say that they will facilitate humanitarian aid to all people who need it in syria. joining me, a fellow and aljazeera's national security contributor, so doug, what does it take to actually get something like this in place? >> well, there's a lot of heavy lifting to do. it shows that there's some appetite for the use of hostility. they didn't use the word, "ceasefire", and there's significance there, but getting it in place will be much harder. you have to apply this, and we should all hold our breath to see if everybody on the ground is going to allow this to happen. >> and that's a great point. what is the tipping point? we know in the last weeks, there are people starving and people on the verge of starving and what's the tipping point here? >> i think that a lot of things are happening simultaneously. you have the russians pushing back in aleppo, and fearing that they're going to have further losses at the hands of the russians, the turks have been upset by the increased attacks by the kurds, and they were feeling a little threatened, and of course the humanitarian situation, the magnifying of that, and bringing it to the fore, it has been bad along and we have gotten a sense of it in the last few days. and it created a magic moment. many of us were uncertain of what would happen, but we're thrilled to see it. >> in the last few hours, there has been a report out that as much as 10p. of the population of syria has been either killed or injured. and the international community has been pulling for something like this to happen. but how optimistic are you, doug that it's going to happen? >> frankly, i'm shocked that we have gotten this far. and you have to put me in a pessimistic camp because something could easily go wrong. but this is a breakthrough, and you have to hope that we gather momentum off of this unexpected first step. >> so doug, let's say that this does happen. and in a week, there's actually as secretary kerry put it, a cessation of hostilities. what could happen after that, considering the momentous step that that could be? >> the first step is to get the humanitarian aid in, and the russians would take that on to avoid all of the complications of having the western planes flying over syrian airspace, so the russians would deliver those supplies to everyone involved. and then once there's the humanitarian aid in place, and you stop the fighting, then there would be two follow-on goals, and one is to get everyone united against the two terrorist groups, isil and el nusra, and then to move toward the long lasting peace negotiations. we're in the very initial stages and let's not get too far ahead of ourselves. >> and in fact, secretary of state, john kerry is speaking. >> it has to be worked out in the negotiations regarding the future negotiations of agency add. and you have to be at the table to deal with that. it doesn't do any good for me to sit here, or sergei or other people that go on and on about what he has or hasn't done. in the end, that has got to be resolved in the context of the negotiation, or through some other leverage. with respect to freezing the current situation, if you will, in this sort of state, i disagree completely. yes, it is true that the bombing of the last weeks, and the aggressive actions of the assad regime, together with the forces from other places and countries that have helped them has made a difference for us. there's no question about that. but that difference doesn't end the war. that difference does not mean that assad is secure or safe for the long-term. it does not mean that syria is free from the scourge of terrorist activity by daesh and others, el nusra and others, and it does not mean that the war is able to end at any time in the foreseeable future. so while yes, there are some advantages, they're not advantages that turn this on its ear. this is still a very complicated conflict with long-term implications, with increasing levels of violence, with increasing numbers of refugees, with increasing numbers of terrorists. and it is our belief that the more successful assad is in securing territory against the opposition, the more successful he is at creating more terrorists who threaten the region. so we have a fundamental task ahead of us, which hopefully this process can shed some light o. as to how we're going to be able to resolve the conflict of one war, which is the war against assad, and also resolve the war, which is the war against the terrorists, and particularly daesh. no somehow undertaking, but very much front and center in all of our thinking, and in the political process that we're trying to create to find a peaceful resolution. >> reporter: [ foreign dialogue ] >> talks about the ceasefire only. this term is not like bid some members of the international support group. >> doug, are you still there? >> i'm still here. >> so what we're listening so is secretary of state john kerry laying out the complexities that still exist in this situation as you were saying, and in particular, he's saying that the more successful that they are in driving back the opposition, he feels that that heightens the tensions there, and creates more terrorists, as he described them, particularly daesh, isil is not part of this agreement. so there are more than a couple, but quite a few things that have to be worked out, even if this ceasefire does come into place. and just because the people at the table agree to the ceasefire, it doesn't mean that the people on the ground will agree to it. >> that's a great point, and in particular, we have been very concerned about the rebel forces themselves. it's unclear if those representing them are always on the ground, and it's not a particular slam on these representatives, but it's inherent in a very disorganized rebel group on the ground. so can they make this happen? and for that matter, will all of the people, all of the parties honor this cessation of hostilities? the iranian backed militias, and various other groups, and of course how do you disentangle everyone from al nusra in particular? >> doug, what impact has russia's involvement in this situation had? >> i think that that's something that we're going to have to debate. there will be those who say that russia has pushed back the rebels and therefore made them willing to come to the table. others will say that it simply created more turmoil, more bad will in the region. we'll have to debate exactly what that means, and i'm unsure myself. >> all right, you're right, a lot of unpacking and untangling in the situation that has to happen, and the cessation of hostility has to begin in a week. we were just talking about the government offensive in aleppo, and let's pause for a moment and watch aljazeera's report from the syrian border in turkey. >> reporter: the syrian opposition has lost more ground in the northern province of aleppo, the air base was not recaptured by the government troops and their allies. it was taken by the ypg and it's allies. syria said that they have been taking advantage of the government's offensive to expand its areas under its control in aleppo. >> ypg militia from the start of the revolution has been working for its own interests. it created an autonomous area, and it never recognized the revolution but used it to create it's own state. >> reporter: the capture means that the ypg is now close to the border crossing with being turkey. it's a concern to turkey, which considers it's group and it's political wing a terrorist organization. >> reporter: pyd has been the unstoppable winner. it will gather it's territorial aspirations and stretch all the way to the west. it's not logical for turkey to get there while isil has a presence. this will draw a reaction from the u.s. and even rush actually >> reporter: the ypg and it's ally are partners in the syrian-led coalition since isil. they are accepting them as allies, but the obama administration has made it clear that this policy is not going to change. and the ypg enjoys good relations with russia. >> reporter: it's a complication. officially, they are not allies, but they have not turned their guns on each other since the start of the uprising. it's not clear if there's any accordnition in the organization in aleppo, but aleppo and the ypg are both heading to the border crossing with turkey. they have received tens of thousands of syrians displaced by the ongoing military operation. turkey continues to be criticized for not allowing them to enter, but it has been argued that they can remain in a syrian designated zone on the border, it would serve turkey's national it security interests by acting as a buffer in keeping the syrian regime away from its doorstep. >> still ahead, what started a prison riot that left dozens of inmates dead. and the mayor of cleveland apologizes after the family of tamir rice is charged for emergency services. the conference call. the ultimate arena for business. hour after hour of diving deep, touching base, and putting ducks in rows. the only problem with conference calls: eventually they have to end. unless you have the comcast business voice mobile app. it lets you switch seamlessly from your desk phone to your mobile with no interruptions. i've never felt so alive. make your business phone mobile with voice mobility. comcast business. built for business. >> cleveland's mayor is apologizing for an invoice sent to the family of tamir rice for emergency medical services rendered to the dying child. it should not have happened. and the billing process is routine, and the invoice for $500 should have been flack never sent out. rice was killed in 2014 when a police cruiser pulled up to him at a playground and an officer shot him in seconds. the 12-year-old was alone, playing with an air soft pellet gun. joining us from los angeles, let's start with tamir rice, and i want to pivot to another case as well. the city didn't just have the bill, but they filed the claim to get the bill paid. were they legally in the right? let's just say legally. >> most cities have a policy, by which if you use their emergency medical vehicles, they can bill you for it, and those services have to be paid by someone. i think what was so shocking about this case was the circumstances. we have this racially charged case that has captured the attention of the entire nation if not the world. and to have the family that has suffered so much, suffered the most egregious loss that you can imagine, to then be sent this bill repeatedly, and it's not just a bill, but there's a lien that was being filed against the family for failure to pay the bill. i was just livid when i saw the story earlier today. and i was elated to see that the mayor of cleveland stepped up and said it was a mistake and clearly made it clear to the family that had they have no financial responsibility for this $500 invoice. >> the situation at least has been remedied. but let's go to another case involving police and lawsuits. a really unusual case out of chicago. 19-year-old antonio grier was shot and killed by a police officer back in december. the officer showed up because quinn antonio was throat thing his father. and the officer shot and killed the 19-year-old and also shot a neighbor as well. now, the officer, areva, is now suing the estate of the 19-year-old who was killed. on what legal grounds? >> i have to tell you, richelle, i've been practicing law for over 20 years, and i've done a lot. i've spent most of my career doing civil rights lawsuits, and lawsuits like the one that the family filed in this case. but to see a counter case, where the family is claiming that quintonio's civil rights have been violated, this is a turn from a legal standpoint. and its shocking to me that the police officer is claiming that he's suffered distress from quintonio's action, which caused him to shoot quintonio, but also the neighbor. it's shocking in this counter lawsuit >> it would seem that the situation that the officer found himself? part of his job. >> absolutely, and it's not unusual when a policeman is involved in a case to file a workers' comp case. there may be stress associated with being in an officer involved shooting but what you don't see is a lawsuit filed against the estate of the person that that officer has killed. let's face it, quintonio was a 19-year-old college student. he doesn't have an estate. we know this is not about money. this was a working class family, and quintonio hadn't had a real job. we know that he has no money to speak of, and he has no assets to speak of, and the lawsuit can only be about leverage. a lot of times lawyers file for leverage. and in this case, the police officer is trying to get leverage in the civil rights lawsuit that was filed by quintonio's family, where they're alleging that the officer deprived him of his constitutional rights by using excessive force? in situation. >> we'll have to see how this plays out. areva martin, thank you. >> in south carolina, bush is a familiar and popular name. both georges won crucial elections there. but so far, it has not worked for jeb. >> reporter: trailing badly in preference polls, jeb bush is trying to jump start his campaign in south carolina. >> i'm sure that it will turn out all right. [ applause ] >> reporter: the welcome was warm at a question-and-answer session in florence. lending a helping hand, the state's senior united states senator s. lef, lindsey graham,o dropped out of the primary to help bush. >> we're going to turn this into a referendum for commander in chief. >> reporter: linda said that she has voted for every bush who has run in south carolina, and she's not about to change. >> i like him because he's a conservative man, and he's a christian, and he loves america. >> reporter: after the event, the former governor took a few questions. >> what is it going to take to turn it around for you? >> we're making progress, we have great crowds, and we're going to work and work. that's all i can do. i can control the things that i can control, and i can't control the things i can't. that's how it works. >> after that, he called on voters to turn their backs on awful his opponents. >> if we win here, we're going to win the table. if we win here, after winning so big in new hampshire, all of these characters are going to give it up. >> reporter: the other republican candidates, senator marco rubio and kasich. >> the only one who can beat donald trump is me. >> reporter: all of them are hoping that he can slow them down enough for them to stay in the race. >> and today is jeb bush's 63rd birthday. and the campaign is celebrating the former governor's special day with a surprise. so in a message to voters, his wife, columba urged voters to go to the website, we're going to show him this card, and i hope that you were name will be on it. democratic candidates will be facing off in milwaukee tonight, though the next primary is far from there. but it's a controversial swing state and it plays a role in november. >> thank you, new hampshire. >> reporter: on the heels of his big win and her big loss in new hampshire. >> it's not whether you get knocked down that matters. it's whether you get back up! >> reporter: hilliary clinton and bernie sanders are taking a pause in campaigning for the next contest in south carolina and nevada to debate in milwaukee. wisconsin doesn't hold it's primary until april 5th, but the choice of venue signals the state's significance in the general election, with the head of the democratic party telling a milwaukee tv station that wisconsin was picked because it's a battle ground state. >> we think it's important to cover the breadth of the country, and when we thought about the midwest, we thought wisconsin was the best place to have t >> reporter: and no wonder, 1984 was the last time that wisconsin backed a republican in a presidential election. but republican governor, scott walker, who dropped his own presidential bid in september is an example of the gop win in the state's midterm election, and since walker's election, the state has gone through big changes, starting with its unions. walker's landmark law in 2011 weakened the collective bargaining power of public employee unions. unions have been a key supporter of democrats, and their numbers have fallen. in 2015, 223,000 workers, or 8.3 workers in wisconsin belonged to unions. that's down from 11.7% just one year earlier, and that number was 14.2% in 2010 when walker was elected. some political observers say that could have an impact in november. >> their fundraisers totals, what they get from dues from union paying members, are down significantly, and so they will have less in the way of financial resources to contest elections here in november, and probably less shoe leather on the part of labor activists involved on the campaign trail this fall >> reporter: and the unions on the defense, after their 2012est to recall the wisconsin governor. but walker hat come out unscathed. his popularity has fallen after his failed white house bid. and it's unclear how much help he'll be to the event republican nominee. the gop already held the debate in the state. and now in 2016, the question is whether democrats can continue their three-decade winning streak in presidential election, or will unions diminish influence in wisconsin change that? >> i think that this november's election will be a good test of whether they're the unions of old or whether we're building a new era in wisconsin. >> reporter: and in a year when they are bucking conventional wisdom, that could be a challenge. >> a potential break through today in the three-month-old gas leak in southern california. the officials at southern california gas said that they have temporarily controlled the gas, and in the next days, they hope to permanently seal that well which has been leaking for months now. 40 people have been killed in a prison riot in mexico. >> reporter: witnesses say the fire and riot began just after midnight on thursday. dozens of prisoners were killed before the authorities took back control of the privilege. the fire lasted for several hours, according to witnesses. it's the largest prison in the state and it's known for being overcrowded. rescue workers evacuated victims, some with burns. on thursday morning, the governor spoke to the press. >> reporter: we have ruled out early jail breaks and want escape attempts with the firearms. a perimeter was set up around want prison, as well as the rest of the prisons in the state. >> reporter: family members gathered outside of the prison and started to try to break their way n several hours after the authorities took control, the family members were still waiting for answers. >> i don't know, please help us. with all-due respect, come out and confront us, give us the names, that's it. where is she? >> in recent years, deadly prison riots have been common in mexico, where rival drug gangs are often howled. he is planning to visit a city in the northern city that used to be controlled by drug cartels. aljazeera, mexico city. >> up next, escalating tension, the latest threats from north korea as diplomatic ties with the south break down, and plugs a 94-year-old nazi guard on trial >> welcome back, we continue to follow breaking news at this hour. a cease-fire in syria's civil war. secretary of state john kerry and his russian counterpart just announced within the hour this agreement at a press conference, and kerry said that they hope this cessation of hostility -- those are the words he used -- will be in place in a week. nato is responding to the refugee crisis in the conflict in syria. multinational ships will go to the mediterranean. each country is struggling to stem the tide of asylum seekers. >> reporter: in defiance of tougher border controls, and in the winter storms in the seas, this group was rescued on tuesday. so far this year, around 1500 people a day are making the dangerous crossing. turkey has taken in some 2 million refugees from the syrian conflict and now wants helpful turkish president, in a critical speech on thursday, warned that without more support, he could simply open the borders and let the refugees leave. >> in the border town we put them in a bus and turned them back, but we can only do this once or twice, and i'm sorry, and open the doors and tell them have a good journey. >> reporter: the nato defense minsters have been meeting in brussels, but the german greek propose ol to send ships was only float opened monday of this week and seemed to take nato by surprise. nevertheless, the ships are being sent. >> our military authorities will work out all of the details as soon as possible. and allies will be looking to reinforce this mission. this is not about stopping or pushing back the refugee boats. nato will continue critical position and surveillance to help counter human trafficking and criminal networks. >> reporter: it's not going to be sailing. the nato group will arrive in the aegean on thursday, and they will have to stay within their own territorial waters. for it to work, they will need the coast guard to work effectively on the nato intelligence provided to it. one thing that this mission is not is an intercept and rescue operation. the refugees that are not saved by the vessels will be returned to turkey, and so far turkey has expressed a willingness to receive them back, but for how much longer? >> more fallout by this weekend's rocket launch by north korea. an industrial-run complex from the north to the south. >> reporter: on the southern side of the korean border, the southern consequence of the rocket launch. heading south from the complex, the joint venture that south korea declared indefinitely closed as of wednesday. >> i feel horrible. if it stops operating, companies like ours have to close business. it's difficult. >> it might be shut down, but i was surprised to see it hang. i feel sorry for the north koreans. >> the vehicles coming through, it's not going to be a quick process. there are companies inside of the industrial complex, and to get all of their equipment out is going to take awhile. but it's clear that it wouldn't be happening at all. north korea said that it's actions is a dangerous declaration of war. freezing all south korean assets, and rejecting all south korean nationals. more than four hours after the deadline that north korea had imposed, the staff members, 280 of them, streamed south. finished products, and materials and valuable equipment all had to be left behind. the capitalist for all of this, sunday's launch by north korea of its long-range rocket a month after it carried out the nuclear test. the launch on thursday, the whole process guided by the nation's young leader. there are mounting reports that kim jong un has had other matters on his mind. a south korea government official said that the chief army staff was executed for corruption and abuse of power this month. the allegations have proved false in the past. but it would chime with a high-level meeting last week, where kim jong un talked about cutting down on corruption. >> a trial began today for a 94-year-old former nazi guard. he's charged with 170,000 counts of accessory to murder fors a involvement in deaths at auschwitz. the few remaining survivors are looking for justice. >> arn elderly man with a dark past. in his youth, he was an ss guard at auschwitz. on thursday, that past caught up with him. he was accused of being an accessory to the murders of at least 170,000 people. auschwitz was the single most murderous camp the nazis ran in the course of the holocaust. it's thought that 1 million jews, and 100,000 others were exterminated there during it's 4-and-a-half-year existence. he has admitted being at the camp at the time. but denied in involvement in mass murder. the prosecution alleges that he met jews as they arrived and may have escorted some to the gas chambers. when the soviet army invaded auschwitz. they found the belongings of those killed. this trial is the first of four such that are due to take place in germany this year. a fact weaponed by the survivors of the camp, who say that they have lived for the chance one day to confront people like him. >> for me, it's only about justice. i would like if the man who is going to stand trial tells the truth about what happened then, he should also tell that. >> very few of the people who survived auschwitz are still alive today. still fewer are those who served with the ss there. hanin says that he's not guilty. but it will be up to the court to decide. aljazeera, munich. >> something to tell you about out of new york. a new york city police officer who shot an unarmed man in a public housing stairwell has been convicted of manslaughter. the officer was patrolling a dark stairway with his gun drawn back in 2014 when he fired that weapon. that bullet killed 28-year-old acai gurley. the officer said that it was an accident, and he startled him. and he is facing up to 15 years in prison. the sentencing is scheduled for april 14th. >> up next, rippling through the universe. how scientists are seeing gravitational waves that were previously undetectable. we'll do our best to explain that to you. the conference call. the ultimate arena for business. hour after hour of diving deep, touching base, and putting ducks in rows. the only problem with conference calls: eventually they have to end. unless you have the comcast business voice mobile app. it lets you switch seamlessly from your desk phone to your mobile with no interruptions. i've never felt so alive. make your business phone mobile with voice mobility. comcast business. built for business. >> albert einstein would be beaming, wouldn't he? the scientists have confirmed the last prediction of einstein's theory of general relativity. jacob joins us from san francisco, and jake, when we heard this, we had to get you on the back phone to explain this to us. and tell us about the landmark discovery. >> well, richelle, let me try to explain the whole of astro physics in under two minutes. but what we're talking about here, gravitational waves moving through space time. space time, the idea is that you and i are living in jello. everything around us in the universe is jello basically, we're the little marshmallows in the ambrosia sitting there. and every time you and i move, we're in theory giving off gravitational waves, and they pass through the jello and warp things around us. and we theorized that we could detect those, but it would take a violent event for us to have a shot at this. and in this case, there were two black holes, 2 billion light years away that collided into each other, and we thought sent out gravitational waves. we knew it would take something like this to make something like this happen, but it had all been theory before now, and today we were able to detect it and measure t. >> and in fact, 100 years ago by einstein himself. so what made it possible to confirm it now? >> that's right, so einstein, literally 100 years ago theorized that the gravetational waves existed but the trouble s. you couldn't measure them, because in theory, holding up a ruler to the jello, ruler is jello too. but scientists have figured out how to do a laser to measure this. a laser gravitational wave observatory. it's a big laser between two points. thanks. and we begin tonight with major news in syria. secretary of state john kerry and russian foreign minister sergei lavrov lead the talks in munich that brought about this agreement. kerry was quick to say it is not a ceasefire but a cause in offensive action in syria. >> we have agreed to implement a nation wise cessation of hostilities to begin in a