the united nations is warning that 1.5 million people are on the brink of famine in south sudan, with half the country facing severe food shortages. armed conflict is fuelling the crisis — many people are unable to grow food — and dozens of aid workers have been kidnapped and murdered in recent months. after years of civil war, a peace deal was signed three years ago between south sudan's government and rebel fighters. but it's been largely ignored by both sides. from juba, our chief africa correspondent anne soy reports. a troubled beginning for the world's youngest nation. tens of thousands have been killed. one in three here is displaced, and now they face the threat offamine. the youngest suffer most. this is the face of starvation. christine jackson weighs half as much as she should at almost two years. she's now on life—saving treatment, but her father worries that he won't be able to feed her well when they get discharged. jackson should be one of the better—off south sudanese. he has a full—time job and a farm, but four years of civil war and high inflation have left him destitute, and there are many families like his. the doctor in charge here tells me this ward is always busy. so, roughly how many children do you see in a month? in a month, we receive around 80—100 cases. right, and that isjust in the capital, juba. this is the hospital that takes care of children from outside the capital, and this ward, really, is the one that takes care of the severely malnourished children. injuba, one in ten children has been found to be severely malnourished — but then, the statistics are higher outside the capital, where life is way more difficult. it is a harsh terrain and security has resulted in the death of more aid workers than anywhere else in the world. they are forced to use air transport, particularly in rebel—controlled areas. we are not heading in with much food and the violence has meant that many of the farmers have fled their farms, and this will occur throuthuly, when the next harvest begins to come in. so this is a crucial time in south sudan. this is when we have do save the lives of the children. explosion. after decades of civil war, south sudan gained independence from its northern neighbour, but its troubles were far from over. fighting broke out between supporters of president salva kiir and the now expelled former vice president, riek machar. a number of ceasefire deals have been struck and broken, sometimes in a matter of hours. there was a peace process... it was violated by them. it was violated as soon as it was signed... it was violated by the rebels. and both the liberals and government were to blame. no, because the rebels find themselves like a spoiled child and they can just do anything they want. with no end in sight to the fighting, these people are at the mercy of donors, and the youngest generation here suffers most. anne soy, bbc news, juba. and you can find more detail and analysis on the current situation in south sudan, including claims that the country's leaders are failing their people, on our website. simply go to bbc.com/news. let's take a look at some of the other stories making the news. white house officials have outlined proposals to give 1.8 million young undocumented immigrants a path towards us citizenship. in return, the trump administration is insisting congress approve a $25 billion fund to finance a border wall with mexico. the trade—off also envisages tougher immigration controls. myanmar has accused bill richardson of a personal attack on aung san suu kyi. the veteran us diplomat resigned from a burmese investigation into violence in rakhine state, calling it a whitewash. he's been a long—standing friend and supporter of aung san suu kyi, but was particularly critical of her, saying she was blinkered and lacked moral leadership. scientists say plastic in the world's oceans is posing a growing threat to coral reefs. they estimate there are 11 billion items of plastic waste on reefs in the asia—pacific region, and coral that comes into contact with plastic is 20 times more likely to develop disease. controllers of a european rocket which suffered a problem shortly after launch say it has deployed the two satellites it was carrying. contact with the ariane 5 was lost several minutes after lift—off from french guiana. the rocket has reputation for reliability, recording more than 80 flights without incident. president trump has again threatened to withdraw american aid from the palestinians unless they return to peace talks with israel. he sparked anger recently among palestinians and beyond by recognising jerusalem as the capital of israel, and palestinians refused to meet vice president mike pence on his recent tour of the region. mr trump spoke at a news conference in davos alongside the israeli prime minister. when they disrespected us a week ago by not allowing our great vice president to see them and we give them hundreds of millions of dollars of aid and support, tremendous numbers, numbers that nobody understands, that money is not going to them unless they sit down and negotiate peace. because, i can tell you that israel does want to make peace. and they will have to want to make peace too. or we will have nothing to do with them. there was an immediate reaction from the palestinians. the ambassador to washington, dr husam zomlot, told the bbc only an international body could oversee peace talks. the most important thing is that we solidify and strengthen our commitment as palestinians, and the palestinian president has been clear that we remain absolutely committed to the two—state solution of 1967, committed to the international consensus and law, and committed to non—violence, and we remain committed to our adherence to a genuine peace process. and that peace process requires international intervention. for many, many years, we were made the exception. in all other conflicts, it was only international mechanisms to deliver principles and success. now, we are seeing no way, we need an international table. president trump has not taken jerusalem off the table — he has taken the table altogether. we need a genuine table that can actually deliver us where we want to go. for more on this, a short time ago i spoke to our correspondent peter bowes in los angeles. the palestinians see this as the table being taken away. there is essentially no forum to negotiate now since the status ofjerusalem is so crucial to any peace agreement. in that respect, donald trump is playing hard ball. to some extent, he is rolling the dice on his stance, whether money will talk more or the lack of money, if he withdraws funds for the palestinians, whether that will in some way for the new round of peace talks. it seems, especially based on what the palestinians have just said, it seems very unlikely. rather than being the president who would preside over a peace deal, as he promised during his campaign last year, this remains to be seen. it is looking rather unlikely. donald trump prides himself on being larger than life unlike anyone else, dominating centre stage. is it actually clear what he wants, if he knows what he wants? well, as far as trade and international business relations, i think what the president wants is at least back at home to be seen as the president, as the leader, who is selling america, putting america first, as he has said many times. he wants, and i think his audience back at home, he wants them to see him on the world stage fighting for his country. he has some good cards at the moment, because the economy is doing really well, and even some of his critics, sceptics back at home, are saying look at what the dow is doing and the status of trade, with the weak dollar, though trump says not for long, it is making trade easier. that is what his base wants to see. how much did he inherited? a lot of america likes what he is doing. as do people at davos. that is right. although you might have expected a bit of a frosty reaction. perhaps there has been in some quarters. he generally seems to have had a good response from the european leaders. a lot will hinge on the details of his keynote speech, how far he pushes things. of course, he is the protectionist president, which goes against the grain as far as leaders in germany and france are concerned, who prefer to have more of a sharing of policy and attitude towards the global economy. we will have to see what the president has to say and the details at the end of friday. thank you very much. at least 41 people are reported killed in a fire at a hospital in south korea. —— a0 people. it's thought the blaze started in the emergency room of the hospital in the city of miryang. let's get more from our correspondent laura bicker in seoul. this story has been sounding worse the more we hear about it. it seems that the fire broke out early this morning here in south korea, firefighters were called and some of the pictures, smoke billowing from the pictures, smoke billowing from the building and a number of elderly residents on second and third floors with rags to their faces trying to get out. it seems a combination of firefighters and local residents came to the rescue, ladders were put up, people were brought out of the hospital, there were 194 patients in the hospital at the time, many of them were in the nursing annex for elderly people, so many of them quite old and infirm. there are pictures of people carrying them on their backs to try to get them free of the fire. now, the blue house president moon has confirmed he has convened an emergency meeting, search and rescue teams have been sent there to see what assistance they can provide. there is also going to be an investigation into how this could happen. just over one months ago in december, 29 people we re months ago in december, 29 people were killed in a sports centre in central korea, and still an investigation going on into that. but with the message that getting from the government today if they are going to ensure something like this could never happen again. laura, thank you for the update. stay with us on bbc news. still to come: a glimpse of the works of art gathered by the greatest royal collector in british history. the shuttle challenger exploded soon after lift—off. there were seven astronauts on board, one of them a woman school teacher. all of them are believed to have been killed. by the evening, tahrir square, the heart of official cairo, was in the hands of the demonstrators. they were using the word "revolution". the earthquake singled out buildings and brought them down in seconds. tonight, the search for any survivors has an increasing desperation about it as the hours pass. the new government is firmly in control of the entire republic of uganda. moscow got its first taste of western fast food as mcdonald's opened their biggest restaurant in pushkin square. but the hundreds of muscovites queued up today will not find it cheap, with a big mac costing half a day's wages for the average russian. this is bbc news. the latest headlines. the un warns one and a half million people are ‘on the brink of famine' in south sudan. more than 40 people have been killed in south korea — after a fire sweeps through a hospital in the southern city of miryang. the oscar—winning actor, casey affleck has pulled out of this year's ceremony, where he was expected to present the academy award for best actress. he won best actor last year, for manchester by the sea, but has settled out of court claims of sexual harassment by two female crew on his mock documentary, i'm still here. he has always denied the claims. i spoke earlier to the entertainment journalist kj matthews, in los angeles, and asked her what she made of casey affleck pulling out. i will be honest, many people in hollywood were not surprised that casey affleck did not want to do this. in the last two months we have had all of these issues, including the time's up initiative. casey affleck was accused of sexual harassment back in 2010 in the movie i'm still here by two female co—workers. he denied those allegations, but settled out of court. some people felt he would not be the best person to present to the winner of the best actress award this year even though he got best actor last year for manchester by the sea. it is not a good look. this has been cooking for a while. when brie larson gave him his oscar, she made it clear how she felt. 20,000 signatures online in a petition as well. many people were against and even showing his face at many premiers, let alone on the red carpet and the oscars. his publicist and team knew it would be difficult for him to walk on the red carpet without being inundated with questions about the accusations he faced many years ago. i will be honest with you, i think there may be other actors in hollywood who made the reconsidering going to the oscars, or perhaps even reconsidering walking on the red carpet if they do not want questions about this change in hollywood. there are many men in hollywood hoping this goes away and keeping their heads down. do you think this has peaked, or is it the beginning? there is no way this will go away. the momentum is really huge. in fact, this weekend, the largest music awards in the us, the grammys, on sunday, in new york, and guess what, the time's up initiative has said people should wear a white rose on sunday to honour the change in hollywood and stand with women in hollywood. it is not slowing down. and the oscars take place on march fourth! a lot is happening, and there is no sign slowing down. thank you very much. a packed commuter train in northern italy has derailed in morning rush hour, leaving at least three people dead and several seriously injured. the service from cremona came off the rails on the outskirts of milan. it's not clear what caused the accident, but a track collapse is being investigated. ajudge in brazil has seized the passport of luiz inacio lula da silva, and banned him from leaving the country. the judge is investigating allegations that the former president illegally lobbied on behalf of a swedish firm which was selling military aircraft to brazil. this week, in a separate case, an appeals court increased his jail sentence for corruption. oprah winfrey has said she doesn't "have the dna" to be us president. she'd been widely touted as a democratic contender for the 2020 elections after that rousing speech at the golden globes. in an interview with instyle magazine, she says the job isn't something that interests her. a group of mostly us scientists has moved the hands of its so—called doomsday clock — a measure devised to illustrate concern over the world's destruction, by nuclear weapons and other threats — forward by 30 seconds. the clock now stands at two minutes to midnight, closer to the symbolic point of annihilation than it's been since the height of the cold war. the scientists, backed by 15 nobel laureates, cited north korea's nuclear and missile programme, climate change and conflicting american policy statements during the presidency of donald trump. in 2017 we moved the clock from 3 to 2.5 minutes to midnight. an unprecedented step that reflected a darkening security landscape, characterised by an increasing recklessness around nuclear rhetoric and increasing attacks on experts and expertise world wide at the exact moment when such expertise is needed. for the first time in many years, in fact, no us—russian nuclear arms control negotiations are under way, and if the draft us nuclear posture review is any guide to us policy, there will be no us—russian nuclear arms control negotiations for the foreseeable future. instead, we could see a return to a nuclear arms race. researchers have identified remains of the earliest known modern humans to have left africa. a new dating of a jaw bone found in a cave in israel indicates that our species was living outside africa around 185,000 years ago, some 80,000 years earlier than previously thought. our science correspondent, pallab ghosh has the details in the distant past, the first of our kind evolved in africa. our ancestors then left the continent and spread across the globe. just when and how that happened is one of the biggest questions in human evolution. this fragment of a jawbone has shattered the current theory. it has rewritten the story of how we emerged on this planet. the jawbone was discovered, along with stone tools, in misliya cave, in northern israel. a study, published in the journal science, shows it is around 200,000 years old — that's tens of thousands of years older than scientists thought that modern humans first left africa. i think that the whole biological history of our own species should be revised. because, if we have modern humans here in israel around 250,000 years it implies that the origin of our species go back in time, not to 250,000 or 300,000 years ago, but probably much earlier, to around half a million years. theories about how modern humans first evolved and spread may now have to be changed. the previously view was that our species began to live africa 100,000 years ago, but the new discovery in israel suggests it was much earlier, possibly 250,000 years ago. that means our species may have lived alongside other kinds of more primitive humans who lived outside of africa at the time, and that contact may have helped to shape our culture and the way we look. it changes really our understanding of the interaction between other populations such as neanderthals. if we say that we have modern homo sapiens in our earlier... these dates, we have to reconsider all our knowledge regarding the environment, the ecology, the culture, and our interbreeding with other populations. the current view is that we evolved relatively recently, just as other types of humans were dying out. but the new study suggests that we are a more ancient species that shared the planet with primitive humans for tens of thousands of years. pallab ghosh, bbc news. he's probably best known as the king who lost his head, but charles the first was also the greatest royal collector of art in british history. among the masterpieces were works by van dyke and rubens. now, for the first time since the 17th century, a major exhibition brings together the most important paintings from the collection. our arts editor, will gompertz, has been to the royal academy to have a look. the show starts by setting the scene. we meet the main protagonist, charles i, king of england, scotla nd charles i, king of england, scotland and ireland from 1625 — scotland and ireland from 1625 - 1649. from 1625 -1649. he had a great eye for art, as did his missus, henrietta maria. both portraits were painted by this fella, the flemish artist anthony van dyck, who king charles i hired as his court painter, oi’ hired as his court painter, or what we would now call nowdays as his artist in residence. he has two main focuses for his collection — that's mantegna's the triumph of caesar, by the way — his first passion was for the german, flemish and dutch artists of the northern renaissance. hence we have this wonder wall of hans holbein portraits, at the end of which is this absolute cracker, of robert cheesman, the royal falconer. his other great love was the artists of the italian high renaissance. people like pisano. and here tintoretto painted this dramatic biblical scene. injust two decades, charles and henrietta amassed an art collection to rival any court in europe but it all came to a very abrupt end when charles had his head chopped off and oliver cromwell flogs the lot. the collection was scattered to the four winds, which is the point of this exhibition. the royal academy is uniting for the first time since 1649 as many of those famous artworks as it possibly can, including this hunting portrait of king charles i, which is now owned by the louvre. ina way by the louvre. in a way this exhibition isa in a way this exhibition is a tragedy, a story of what could have been. great masterpieces which were once owned by this country but are now owned by others. take this wall of titians, for example, the one on the left now belongs to the prado in madrid, and the other two are the louvres' in paris. still that is the nature of things, i suppose, but this exhibition does make you wonder what if charles i had not lost his head and continued to collect at the same sort of rate. britain would own surely the greatest collection of renaissance art in the world. mind you, he probably would have bankrupted mind you, he probably would have bankru pted the country. will gompertz, bbc news, the royal academy. just before we go some more pictures for you from cairo. virtue of the ancient sun king rameses has moved toa ancient sun king rameses has moved to a new home. it is quite a business. it weighs 83 tons. it is being transferred to the atrium of the grand egyptian museum. the hope is that it will help wind back tourist. a ceremony to help mark the move mentioned the importance of the museum to tourism which has been heavily impacted by fighting. hello. friday will be the coldest day of the week but, with lighter winds, most of us seeing some sunshine at some stage of the day. our perception may well be, as we are in between weather systems with lots of dry weather, it's the most pleasant weather day of the week but weather fronts are coming in for the weekend as we will show you in a moment. this is how it looks for early risers. a few showers dotted about through parts of england and wales. and cold enough for a touch of frost where you've been clear for any period of time overnight, particularly across parts of scotland, into northern ireland and maybe north—west england, some spots in wales as well. a few fog patches into northern ireland to begin the day will take a few hours to clear. and as i mentioned, a few showers dotted about, particularly through central and eastern parts of england. very hit and miss. by no means everybody will catch one, but be aware that is a possibility first thing in the morning. we are more likely to be seeing some sunny spells once the sun is up into wales and south—west england. some spots will be around four or five degrees for 8 o'clock in the morning. not going to get too much higher during the day, but as you can see there's a fair amount of sunshine around. though, even though the showers are going to clear away from central and eastern parts of england, some of us here will have more cloud compared with thursday. but even here, a few sunny spells coming through into the afternoon. fairly light winds and, as you see, temperatures top at around 4—5 degrees in scotland. 7—9 degrees the mildest parts of northern ireland, england and wales. going into the evening, though, the breeze starts to pick up and we get some outbreaks of rain running into northern ireland and western scotland, and that starts to push a little bit further east as we go on through friday night and into saturday morning. which means as saturday begins, a lot of those temperatures will be down the eastern side of the uk. and here, where we have been clear for any period of time, initially on friday night, and here, where we have been clear for any period of time, initially on friday night, there could well be a touch of frost developing. here is the big picture going into the weekend. weather fronts are coming in. as you can see, initially through western parts, with some heavier bursts as the day begins. it all starts to move eastwards. so even where you are starting the day, east anglia, south—east england, perhaps teased with some early sunshine, some outbreaks of rain moving into the afternoon, but light, quite patchy here. elsewhere brightening up a bit as the afternoon goes on, once that rain has cleared away. further showers cominginto northern scotland. it's a milder day but it's a windier day and the wind picks up even further on saturday night and into the first part of sunday across the far north. in the shetland isles there could be some severe gales for a time. but the main story for the weekend will be the mild air in place, still with us on sunday. still though with a lot of cloud on sunday, patchy rain and drizzle across western parts and heavier rain in north—west scotland. mild and windy. this is bbc news. the headlines: the united nations is warning that 1.5 million people are on the brink of famine in south sudan, with half the country facing severe food shortages. armed conflict is fuelling the crisis — many people are unable to grow food — and dozens of aid workers have been kidnapped and murdered. fire has swept through a hospital in south korea, killing more than 30 people. -- 40. the south korean president, moonjae—in, has held an emergency meeting to discuss the government's response. it's the second major fire in the country in little more a month. president trump has again threatened to stop aid to the palestinians unless they engage in peace talks with israel. he was speaking in davos, alongside the israeli prime minister. mr trump angered palestinians recently by recognising jerusalem as israel's capital. a former palestinian negotiator has accused him of leading the region towards chaos. now on bbc news, it's hardtalk. welcome to hardtalk.