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>> this is "bbc world news america." i'm kathy k. in south sudan the youngest nation faces one of the oldest problems, fighting. and the prospect of civil war. a top aidetie fires after e-mail suggested she created traffic jams as political payback. can he weather the storm? >> i am embarrassed and humiliated by the conduct of some of the people on my team. >> and capturing some of the most amazing tribes before they disappear from the world. one photographer has focused on these extraordinary faces.

welcome, to our viewers on public television in the world and around the globe. less than three years after america helped south sudan become the youngest nation, tonight there are warnings of civil war. government troops are closing in on a key rebel stronghold and thousands of civilians are filling in panic. the city has been held by rebels for the past two weeks and it has been a strategic hub for the country's oil-producing region. our correspondent sent us this report. knowople in south sudan when trouble is coming. they have been running from war for decades. this dusty town is the capital of a state rich in oil and rebel held. these are the soldiers that switched sides and know the wind is changing. thousands fled here to be safety

of the u.n. compound two weeks ago. you were from became a question of life or death. >> they came into her home at midnight -- into our home at midnight. he started shooting. >> they have food and clean water supplies are short. baby.is no place for a >> i am worried about fighting. how long are we going to stay here? >> the finding is coming here again. the frontline shifted. we thought the battle had begun, this was the rebels destroying ammunition. in need of help. with food running low, the u.n. decided to take a risk. an aid mission into town to

fetch food supplies from the u.n. warehouse, as civilians continue to flee. in the a u.n. compound center. they came here to pick up food before the fighting started. area, more to this than 1000 people came into this compound to try to get shelter from the fighting. now they have become the priority. the u.n. is trying to get them out. with gunfire already heard nearby, they have to move fast. time butnever enough an opportunity like this comes along. they took who they could and would return for the rest. they reached the camp safely but a mission for food brought only more people. the rift between tribes has been reopened by this crisis. all talks about peace go

nowhere, the fear is more fighting will come. echoing those fears, the top u.s. diplomat for africa warns lawmakers the risk of an all-out civil war is growing with each additional day of violence in south sudan. among the witnesses providing testimony was the cofounder of the enough project and he joined me a short time ago. you spent a lot of time in south sudan. how bad is the situation at the moment? >> it is deteriorating rapidly. there are 200,000 people who are displaced but that is the own -- that is only people we have access to. which thelarge parts international community has no access to. when we find new groups of people, it is usually they have no possessions, they had to run out of their homes. they have nothing to sustain them.

so when people are found in these situations, they usually need emergency provisions. -- there supply chains are not supply chance to respond to them. >> the country was born to and a half years ago among optimism and elections that were heralded as as a success. what happened to cause the spike in violence? division within the ruling party in south sudan. there was not any real work done to try to heal those divisions. you go back decades, a lot of bad blood. was,there was a spark that a match was late, basically in mid-december. everything erupted. along linese down they had battled him previously during the long civil war between the north and the south. that hadivalries

manifested themselves but had been addressed in unification able, the referendum was that was papered over during the referendum and blew up again. these divisions had never healed and now they had solidified themselves. >> we saw in the report of the are trying to do what they can to help. what could the united states be doing in this process? >> there is immediate civilian protection priorities, helping the united nations peacekeepers getting assistance. i think the united states is doing all it can. we can help construct the peace process that is comprehensive and addresses the root causes of this attempt to try to build a new state in south sudan. there has not been any reconciliation effort, any peace effort to get at those core

causes of conflict. until we do that, the nation will be on shaky ground. that is where the united states can help support building that peace process in order for the parties to address those causes. >> you are testifying on capitol hill today and you credited the united states with the help it has given south sudan so far. the u.s. was instrumental in making this nation. do you think it has leverage when it comes to the peace process to say to the warring factions you have to do something to keep the country together or it will fall apart? >> we have officials with long history in south sudan and sudan issues. john kerry and susan rice, others, are respected a great deal in south sudan. i think that gives us a lot of leverage. second, there is a historical connection to the people of south sudan and the people of

the united states. human rights groups, there has been a history of solidarity. is not like this and other parts of the world, and the united states and china have similar interests in resolving the conflict in south sudan. if the u.s. and china can work together, that is where the leverage is going to come from. i think it president obama reaches out to beijing and says let's work together on this and make this an effort, i think that will influence and affect the calculations to the parties on the ground. thanks verydergast, much. a lot of countries with a lot of interest in south sudan. health of the former israeli prime minister, who has been in a coma, has deteriorated. the medical center where he is being treated says he is in grave condition and his family is by his bayside. he was incapacitated by a stroke in two thousand six.

traffic jams are often associated with frayed nerves but in new jersey today they are the subject of a scandal that could cost a presidential hopeful his political ambitions. for two hours today the governor chris christie held a press conference in which he declared he had no knowledge that one of his top aides had prompted a traffic jam on one of the busiest ridges as political payback. mark mardell explains it all from new jersey. upthis is the snarl deliberately inflicted the between suburban cities and new york. a painful punishment for their mayor who would not back risk christie's reelection campaign. today, there was none of the usual confidence. it was a contrite christie. >> i am embarrassed and

humiliated by the conduct of some of the people on my team. >> the victim says a lot about christie. petty politics. there is a distinction whether i find the governor to be sincere and truthful and honest and forthright and whether or not i believe there was a culture created that would allow these folks to do this. >> the aid delivered to lee targeted the city and the mayor. time for some traffic troubles in for to me, she wrote. two lanes were closed and the traffic jam followed. one e-mail said -- is it wrong i am smiling? --traffic smote hubley flowed smoothly, questions about the way forward for the governor. the chaos injured on this bridge

in a political jam. it could bring his journey to a grinding halt. it will at least slow it down. he is already a hugely controversial figure. he worked with obama after hurricane sandy. won new jersey twice. despite his bipartisan appeal, he relishes confrontation. some call it going -- it b ullying. >> people around him felt empowered because he is a bully. they feel they can do whatever they want. i am glad he is getting his comeuppance. >> i'm going to have to look into a carefully. >> american politics is littered with promising careers broken by scandals but also tales of redemption. chris christie's story is not

over yet. >> for more on the potential fallout from this, i spoke with matthew dowd. matthew, thank you for coming in. we should make clear we are interested in this story and viewers might be interested because chris christie has the potential to run for the presidency of the united states. does this change that? >> he was probably the most dominant republican on the scene for 2016 and the one most believed could win the white house. so it is a big deal. even though the smallness of it. wellught he handled it today. the idea of making it go two hours through all of the oxygen out of the room and left people exhausted. facts state of the way he said they were, i think he will survive and come out stronger. the question becomes, are there more shoes to drop? is there a pattern? the first time is a mistake. the second time it is troubling.

the third strike you are out. that is the question in the coming days, is there a pattern that is revealed in other conversations that takes a back what he said today at the press conference? >> american elections are unlike any around the world. for a start they are very long, we are two and half years away from 2016. how much do americans really focus on somebody like chris christie? how much do they know about him and could this be their first introduction? hethis is part of it because won overwhelmingly in new jersey and i think these things start to get into the water table. it will not necessarily affect it on its own but instead of brash, which people like, if he i thinklike a soprano, if that gets in the water table, that can stay for ever. and so it is a drip or it is a

gallon in the water of the question of, does it get tied to other things? part of the reason he is interesting is because what you suggested, he walks a line between things something of a bully and the perception he is somebody who is tough enough that things can get done. which way does he risk following? what does the american public want from him? >> the number one value he has on the national scale is authenticity. he is unlike any other politician. he says what he means. he speaks roughly. he says the facts as they are. he is not poll tested, which is a shot dead other politicians. and i think that is a good thing. it changes too, you are out of control and you can't control your emotions or your staff or it can't be evenhanded, then

becomes a liability instead of an asset. today i think it is an asset but there are questions in people's minds. i think the days and weeks ahead are going to tell us if the facts today are true and they line up for him. if not, if we hear about other incidences, which i would not be surprised, where staff did certain things, people will start to question his capacity to lead in a measured way. >> matthew dowd, thank you very much. it is already being called "bridgegate." you are watching "bbc world news america." she is the $16 trillion woman. where does janet yellen think the economy is heading? an exclusive interview gives us some clues. at least five people have been killed and 12 injured in an explosion at a chemical factory in japan. the plant is owned by

mitsubishi, which makes car parts. it has taken place during maintenance work. from news helicopters over the site, there is little sign of damage from the explosion that ripped through this chemical plant just after lunchtime. somewhere inside the maze of buildings, the powerful blast tore apart a heat exchanger. a number of workers were inside of workers were inside at the time, cleaning the equipment. some news reports suggested water used for the cleaning may have mixed with chemical residue inside of the heat exchanger, which produced a hydrogen explosion. a similar but nonfatal accident happened at the same plant two years ago. this time when rescue services right, they found five workers dead at the scene. injured,12 others were

although most not seriously. debts from industrial accidents in japan have been steadily declining over 20 years. 2500 to just.5 -- over 1000 in 2010. that is still considerably higher than many western european countries. perhaps because japan has a large manufacturing economy. the retired american basketball star dennis rodman has apologized for comments he made about the american imprisoned in north korea. implied he was at fault for his incarceration. comments says he now regrets. he blamed his words on alcohol and stress and says his dreams of basketball diplomacy were falling apart.

she has one of the most important jobs in the world and in just a few days janet yellen will take her post as the first woman to head the u.s. federal reserve. she will try to stir on the american economy and that she does so her every move will be watched around the globe. so what can we expect? lie in ane answers exclusive interview she granted to time magazine. she spoke with the assistant managing editor who joins me now from new york. thank you for joining us. congratulations on the interview. what did you think her priorities are? >> employment. and main street america. not wall street. minded scholar who has always cared about the real world impact of economics. that is why she got into policy. she wanted to work with real people and make the decisions that are going to have an intake -- an impact. i think she will be paring back

verysset buying program slowly and methodically. i think she will be looking at a lot of data making sure as the fed does that, the recovery is not being derailed. as she told me, she grew up hearing stories about the depression. she grew up in brooklyn in a working-class neighborhood. she saw laborers coming in, paying him two dollars or not, depending how they were doing. she understands working-class america and the human impact of employment. >> you point out that even the language she uses is not necessarily the kind of language we might expect from a fed chair. it is more human. >> absolutely. it has always been her priority to be clear and you can see that in the formal communiqués, which have gotten more understandable for those of us that read them. personally as well.

we talked about her marriage. how she raised her children. who was doing the diapers. i do not think you would have that conversation with alan greenspan or ben bernanke. >> so given you have an understanding of for priority, ordinary households, real wages, unemployment. how much leverage does she have? doesn't really come down to the speed with which she jots back the stimulus money? ofwell, that is a big part it. her priority is going to be getting the u.s. very carefully out of this unprecedented monetary stimulus. almost $4 trillion since the beginning of the financial crisis. but i think also she will be experimenting with new tools. she is going to use forward guidance, going out to the markets and saying we're going to keep interest rates low until employment is higher and the economy is more robust. will the markets believe her?

a few months ago when the fed began to hint about it tapering, you saw a real interest rates begin to go up and that did derail the housing recovery. >> fascinating interview. i am sure people are reading it around the world. thanks very much. now for a look at some faces and places that few people ever see. photographer jimmy nelson has spent four years capturing disappearing tribes and their culture. the result is an incredible collection of images featured in a new book. he talked to the bbc about his journey and the people he met. ♪ andhese people are chosen represents the last, most originally authentic mama beautiful people in all of their glory. name is jimmy nelson. i work as a photographer and this book is a project of mine

called "before they pass away." we are attracted to beautiful people. and these people in all of their that have not been given time. have not been given that potential. that iconography. i really believe these people have a sense of beauty, something we really have lost. the pictures showing me standing up to my knees in the river warnd my camera with this you're looking over me from behind is a favorite picture. down, byg yourself taking this old camera, by limiting myself to 100 images, you become desperately focused. and the end result of the picture of them standing under this waterfall. the people i photographed live in northwestern

mongolia. they are hollywood-esque. you can't believe these people really look the way they do. you can't believe the environment they live in, they hunt and they write in it -- ride in is for real. these men are beautiful. they are tall and elegant. they could easily be women and often people go those ladies that great. they are stunning. i say they are not women. they are men. they can literally kill lions with their bare hands. and far north of eastern siberia, there is this group, there is about 60 of them left living in the tundra. it is like arriving in shangri- la. there they are, smoke coming out of the tent. it was the most blissful feeling of, we found them. in an area larger than france, we found 30 of the last people.

i have to be careful, inquiries country and culture. there is so little of it (one part, that is this valley. it is a tiny kingdom that was opened about 10 years ago. it really is pure tibetan culture. what is a disaster is that the authorities have a license to build a highway from china all the way down through nepal into india. so these images i made, i dare to say maybe some of the last images of this authentic culture in its purest form. >> jimmy nelson there was some really incredible images and they are all put together in a book, which i can't wait to get a hold of. that brings a probe -- the program to the close. you can watch on our own a four hour news channel as well. i am katty kay. thank you for watching.

>> funding of this presentation is made possible by the freeman foundation, newman's own foundation, giving all profits to charity and pursuing the common good for over 30 years, union bank, and charles schwab. >> it is insane around here. you stand behind what you think. around here, you don't make excuses. you make commitments. when you can't live up to them, you own up and make it right. some people think the kind of accountability that thrives on so many streets in this country has gone missing in places where it is needed most, but i know you will still find it when you know where to look. >> at union bank, our relationship managers work hard to understand the industry you

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captioning sponsored by macneil/lehrer productions >> ifill: new jersey governor chris christie said he was "embarrassed and humiliated" to learn a top aide ordered lanes closed on a major bridge for political revenge. good evening. i'm gwen ifill. >> woodruff: and i'm judy woodruff. also ahead this thursday, a different governor warns of a "full-blown heroin crisis" in his state. we get two perspectives, including that of the vermont democrat peter shumlin. >> ifill: plus, jeffrey brown and poet laureate natasha trethewey continue their travels to find "where poetry lives." tonight, how doctors are using verse to provide better care.