this is bbc news. i'm lewis vaughan jones. our top stories: us intelligence officials say saudi arabia's crown prince personally approved an operation that killed the journalist jamal khashoggi. another abduction of schoolchildren in nigeria. more than 300 girls have been taken. president biden visits texas to see how it's recovering from the freezing weather that left millions without power or clean water. more good news on the effectiveness of covid vaccines — a british study shows even a single dose of the pfizerjab helps stop the virus spreading. an iceberg, the size of greater london, breaks off from the antarctic ice—shelf. scientists say the split is due to natural processes, rather than climate change.

it's the first time i have been on an open—top bus. is it really? yeah — not really allowed to. and, prince harry gets on a tourist bus in california to talk about his new life in the us and why he left the uk. it was destroying my mental health. really? i was like this is toxic. yeah. so i did what any husband and what any father would do. it's like, i need to get my family out of here. welcome to our viewers on pbs in america and around the globe. we start with that us intelligence report on the killing ofjamal khashoggi. it accuses saudi arabia's crown prince, mohammed bin salman, of personally approving the operation which led to the murder of the journalist in 2018.

it's the first time the us has officially and openly accused the crown prince, who is a key american ally in the middle east. saudi arabia has dismissed the american claims as false and unacceptable. here's nick bryant. it was at the saudi consulate in istanbul that jamal khashoggi met his brutal end. he had been lured there to discuss paperwork for his upcoming wedding but he was strangled as soon as he entered the building by a team of saudi assassins, who then dismembered his body. a saudi dissident who wrote a column for the washington post, often criticising his country's authoritarian leadership — the motive was to silence him. the damning conclusion of the declassified intelligence report is that saudi arabia's crown prince mohammed bin salman, the country's de facto leader, approved an operation in istanbul to capture or kill the saudi journalist. the assessment was based on the crown prince's control of decision—making in

the kingdom, the direct involvement of a key advisor and members of his protective detail in the operation. these aren't new findings. the trump administration had suppressed this report. ahead of its release, presidentjoe biden spoke by phone to king salman of saudi arabia, the crown prince's father — all part of a deliberate move by the new administration to alter the relationship with the saudis, to be tougher on this oil—rich kingdom. we have significant ongoing interests. we remain committed to the defence of the kingdom. but we also want to make sure — and this is what the president has said from the outset — that the relationship better reflects our interests and our values. and so what we have done by the actions that we have taken is really not to rupture the relationship but to recalibrate it. already, mr biden has ordered an end to arms sales and other us support to the saudis in their war in yemen.

as a candidate, he referred to saudi arabia as a "pariah state" but he's stopped short of imposing sanctions on mohammed bin salman, the future king, who is known as mbs. this new, tougher approach has drawn support from both democrats and leading republicans. look, this is a journalist working on american soil, working for an american publication, and he was murdered and dismembered. this is something we can'tjust look beyond. there has to be a consequence of that. donald trump was very much in step with the saudis. significantly, it was the first foreign country he visited as president. and as well as turning a blind eye to the country's human rights record, he had a warm relationship with mohammed bin salman. when they met at a 620 summit injapan, he was asked about the murder of the saudi journalist, but clearly did not want it to sour their personal rapport. mr president, have you addressed the murder of jamal khashoggi, sir? er... thank you very much, i appreciate it.

under donald trump, the saudis almost had a blank cheque. those days are over. nick bryant, bbc news, new york. president biden hasjust been speaking to a reporter from univision, a texas—based hispanic broadcaster, in houston. he was asked how far he was willing to press saudi arabia to comply with human rights laws. i spoke yesterday with the king, not the prince specifically, that the rules are changing and we will announce significant changes today and on monday. we will hold them accountable for human rights abuses and we will make sure that they, in fact, you know, if they want to do with us, they have to deal with us in a way that human rights abuses are dealt with and we're trying to do this across the world but particularly here. i spoke to abdullah alaoudh, who's research director for saudi arabia at the non—profit organisation dawn democracy, for the arab world now. i asked him what his reaction

was to the us intelligence report. well, first of all, we were glad that it came out finally and the administration finally followed the law that was enacted by the congress after the killing of khashoggi and we think it's a very — a huge step, but also a first step. 0k, a first step, then. would you like to see the crown prince be held accountable in some way? absolutely, and that's why — that's when we get disappointed at the administration today. while we were glad that the report point finger — points the finger to mbs, implicates him in the murder in a very transparent way, we think that not sanctioning him and falling short of that move is unfortunate.

so you would want sanctions — what would that mean? well, things like freezing assets, banning him from travel and coming to the us or any other western country and putting him actually — allowing for legal actions against him — and we already started this, so it means, part of this is to not give him immunity as the head of a state. i see, but the flip side of that, of course, is that the us does have to have very important strategic relations with this very important country. yeah, but the strategic relationship should actually be established with the saudi institutions, with the saudi public, with the saudi long—term kind of relationship that actually should, should go beyond mbs and should not, i mean, we should not put all the eggs in the basket of mbs. mbs isjust a guy.

he does not represent saudi arabia, he does not represent the saudi public, he does not represent the saudi interest. i mean, it is not in the saudi best interest to go to war in yemen or to blockade qatar or to put the prime minister of lebanon under house arrest or to cut a relationship with canada over a tweet or to imprison prominent human rights defenders or kill jamal khashoggi at the consulate in istanbul. this is not in the best interest of saudi arabia. 0k, just lastly and briefly, i'm afraid, because we're almost out of time, but no sanctions, you listed what you would like to see. just in a couple of words, how confident are you do you think you will see any of that? well, i think from how the biden administration actually treated the saudi government, it's — i'm very hopeful that this will happen at one point in the nearfuture, i guess, because they already downgraded him from the de

facto ruler and crown prince to defence minister, and this is really a good deal and a big deal, it is a big deal because the trump administration used to protect him, to give him this kind of protection. this is not the trump administration any more. to nigeria now and another abduction of hundreds of school children. president muhammadu buhari says the government will not succumb to blackmail by criminals who target innocent children, following the abduction this time of 317 schoolgirls from a boarding school. the kidnapping occured in the northwest state of zamfara. the governor has ordered all schools to close in response. mayenijones reports. the lucky few. these students were amongst those who are not kidnapped on friday morning. over 100 gunmen stormed this all—girls secondary school in the town ofjangebe, taking 317 students with them.

security forces have been deployed to the area. we are on the trail of the kidnappers — that's why you find us on the fringes of the forest here as part of our locational efforts, and as part of our cordoning efforts. anxious parents gathered outside the school all day, waiting for news of their loved ones. abductions of this type have become increasingly common in northern nigeria. just last week, 42 people, including 27 students, were kidnapped in the central state of niger. they are yet to be released. in december, more than 300 boys were kidnapped by gunmen and later released after negotiations. it's not clear who carried out that attack. but it was a 2014 kidnapping of 276 girls in the town of chibok by islamist militants that brought global attention to mounting insecurity in the country. that kidnapping was carried out by the extremist group boko haram. although they have not been active in north—western

nigeria, there is evidence their area of activity could be expanding. we know that one of the major institutions objected by boko haram, that has been operating in nigeria for over ten years, is secular education, and we know that boko haram has been infiltrating the criminal gangs in the north—west and they have succeeded in the past 18 months or so, so i would not be surprised if these people are doing it for some ideological reasons or at least this indicates to us the pathological hatred they have for school, possibly because they did not have the opportunity of attending any. criminals have been encouraged by the publicity that followed the abduction of the chibok girls. they know it is an effective way of pressuring the government. and with no clear strategy to stop them, northern nigeria remains one of the most unsafe places in the world for children. mayenijones, bbc news, lagos.

let's get some of the day's other news. a review by the united nations of global plans to cut dangerous levels of climate change. the un says countries need to be more ambitious if they want to cut greenhouse gas emissions by half before 2030. more than 400 people have escaped from a jail in haiti during a riot that left 25 people dead. the escape took place from the prison in the suburbs of capital port—au—prince on thursday after mass violence. authorities said the prison�*s director died during the riot along with innocent bystanders. vets in spain say that nearly 900 young bulls held on board a ship for nearly three months with little food will have to be destroyed. they say the animals had suffered for too long after the lebanese—flagged vessel was refused entry at several mediterranean ports over fears the cattle had contracted bovine bluetongue virus.

to the us, and the latest on that extreme winter storm in texas. us presidentjoe biden visited the state to see how it's recovering from the freezing weather that left millions without power or clean water. the president and first lady went to a food bank in houston, where they helped put together supplies for distribution. they also met staff at a coronavirus vaccination centre and had this message for texans. jill and i wanted to visit texas today for a couple of reasons. first and foremost, to let the people of texas know our prayers are with you in this aftermath of this winter storm. and, secondly, to let you know what i told governor abbott and mayor turner and judge hidalgo and the congressional delegation that we will be true partners to help you recover and rebuild from the storms and this pandemic and the economic crisis. we're in for the long haul. reggie young works at the houston food bank that the president and the first lady toured. he told me what mr

biden said to him. we showed him everything. we showed him ourfleet, our trucks, we showed him our warehouse but we also introduced him to some of the clients of the families that have been impacted by the freeze. so he got a chance to hear their stories first—hand as well as meet the volunteers who have been helping us to respond. and what was his thoughts, what did he say to you? yeah, so he was very concerned about what was going on. we talked a lot about the amount of people who were impacted by this struggle and how we were responding to it. he really said that he supported our work and thought that our operation was amazing, but he was really touched by the families that were there and the work that they were doing to bounce back, based on all the things that happened to them. and what are some of the stress points right now, what are some of the things that people need? yes, absolutely the number one

thing people absolutely need is water. even though water is back and running in most of our region, the challenges that a lot of people have broken pipes and they can't run water, they can't cook their food with this water — they can't do a lot of things. they can't bake. one of the main things we're trying to do is really source a lot more water into the region so we can get it to in need. ——to families in need. stay with us on bbc news, still to come: prince harry on american tv to talk about work, family, and leaving the royal life behind. prince charles has chosen his bride. the prince proposed to lady diana spencer three weeks ago. she accepted, she says, without hesitation. as revolutions go, this had its fair share of bullets. a climax in the night outside the gates of mr marcos�* sanctuary, malaca nang — the name itself symbolising one of the cruellest regimes of modern asia. the world's first clone has been produced of an adult mammal. scientists in scotland have produced a sheep called dolly

using a cell from another sheep. warren beatty and faye dunaway announced to the world - that the winner of best film was la la land. . the only trouble was it wasn't. the mistake was only put right in the middle of gushing - speeches by the team - behind the modern musical. not for 20 years have locusts been seen in such numbers in this part of africa. some of the swarms have been ten miles long. this is the last time the public will see this pope. very soon, for the sake of the credibility and authority of the next pope, benedict xvi will, in his own words, be hidden from the world for the rest of his life. this is bbc world news, the latest headlines: a declassified us intelligence report says that the saudi crown prince approved and likely ordered the murder of the journalist jamal khashoggi. the crown prince denies the accusation.

security forces in nigeria are searching for more than 300 girls who were abducted from a school. the second kidnapping injust over a week. there's further evidence vaccines may help prevent the spread of coronavirus as well as protecting against getting ill. a study of healthcare workers in cambridge here in the uk, found a single dose of the pfizer vaccine dramatically cuts the risk of getting the virus without symptoms. 0ur medical editor fergus walsh reports. like thousands of healthcare workers in cambridge, daniela does a weekly swab test for coronavirus before she goes to work at addenbrooke�*s hospital. it will show whether she could be carrying the virus about displaying symptoms. that swab is analysed at these university labs, where they compare the results from staff like daniela who'd received the pfizer vaccine

with those yet to be immunised. in early data, they found that two weeks after the first dose the risk of asymptomatic infection — carrying the virus without knowing it — was reduced by 75%. an england—wide study of health workers found a similar protective effect. this is a genuine good news story. people should be really pleased that the vaccine will protect them, and they should have the vaccine in order to prevent themselves and others from getting infected. hi, laura. hi. can i check your blood pressure? daniela is a nursing apprentice at addenbrooke�*s. nearly nine in 10 staff here have had their first dose of vaccine — important, as it reduces the chance of getting infected and may protect patients. it makes me feel very happy knowing that i will not pass the virus to anyone around me. it's very reassuring,

very reassuring. it was one of the big unknowns, can vaccines help slow transmission of coronavirus? the study here adds to growing evidence that they do. that has huge implications. it suggests vaccination benefits notjust the individual but the wider community. it's vital people have both doses of vaccine. but while highly effective, they don't offer 100% protection from catching coronavirus or passing it on. so while infection rates remain high, social distancing will continue to be important. fergus walsh, bbc news. an iceberg the size of greater london has broken away from the antarctic. the split was detected just 20 kilometres from britain's halley research station, on the brunt ice shelf.

for months say they'll use satellite images to track the iceberg, and to monitor instabilities on the remaining helen fricker is a glaciologist and professor at the scripps institution of oceanography in san diego, and earlier i asked her about the size of the iceberg that had broken off from the ice shelf. yes, so, it's about 1,300 square kilometres, about the size of manhattan or greater london, as you said. and is that a big, medium, small...? it is, we do get very large icebergs coming from antarctica, i would call it a medium one. there have been larger icebergs. also, there are very small events as well. this is quite a large one. we will see it for a long time in the ocean in satellite imagery. what is going on? why has it happened?

antarctica has to lose mass when it gains through snowfall. snowfalls on this massive ice sheet, down at the bottom of the planet, and it very slowly accumulates over a large area and has to lose it as well. so, iceberg calving, you can think of it like housekeeping. 0r, it's like checks and balances for the ice sheets. the ice sheet needs to stay around about the same size. because of all of the snow that is being added slowly over time, over that large area, it needs to lose it as well. very infrequently we get these very large calving events like this one. and because they are infrequent, they take us a little bit by surprise because they do not happen very often. that is very interesting. this isn't the result of climate change? no, this one in particular, you couldn't put this one down

to climate change, we have been looking at this region for a long time. there is no significant thinning of the ice shelf or anything like that. the whole thing is this part of antarctica. 0k. where is this iceberg off to, then, and how are you going to track it? satellite imagery will be used to track it and the most likely path will be — it gets dragged in ocean currents, about nine tenths of the iceberg is below the ocean's surface because it is floating. and the ocean currents will drag it very slowly. it will probably go in the sea, clockwise in the weddell sea gyre. it will be off the continental shelf break, and when it gets to the antarctic peninsula, the arm that sticks up towards south america, it will follow the east coast of the antarctic peninsula, and that is what we call iceberg alley, where many icebergs go up. helen fricker. then it will go into near south

georgia, which is very close to where the iceberg that came off licensee in 2017 ended up quite recently, and where we thought it might ground. a£111" recently, and where we thought it might ground.— it might ground. our thanks to helen fricker. _ britain's prince harry says he felt forced to step back from his duties with the royal family because press coverage was damaging his mental health. he's been speaking with the chat show host james corden, on a us television show. and our royal correspondent daniela relph was watching. here we are. this is very nice. yeah. it's the first time i've been on an open—top bus. is it really?! yeah. no! not really allowed to. in the la sunshine, from the top deck of a tourist bus, prince harry opened up to his friend james corden about leaving the uk and, ultimately, royal duty. it was never walking away, it was... it was stepping back

rather than stepping down. right. you know, it was a really difficult environment, as i think a lot of people saw. we all know what the british press can be like and it was destroying my mental health. i was like, this is toxic. so, i did what any husband and what any father would do, i was like, i need to get my family out of here. there were lighter moments, too, including a call to his wife. haz, how's your tour of la going? - haz? i didn't know we were calling you �*haz�* now! no, you're not my wife, so...! james corden offered a sympathetic ear and harry was clearly at ease. he revealed that he had watched the tv series the crown, his son archie's first word was �*crocodile' and there'd been a special gift from the queen. interestingly, my grandmother asked us what archie wanted for christmas and meg said a waffle maker. sorry, you're glossing over the fact that i cannot for the life of me imagine the queen ordering a waffle maker! for two brits living in california, there were some memories of home. there you go, a little slice of home, huh? next weekend, it will be meghan�*s turn, with the broadcast of her interview with oprah winfrey.

daniela relph, bbc news. lady gaga's two french bulldogs have been found safe after they were stolen at gunpoint in hollywood. the singer had offered a $500,000 reward for their return — although it's not clear who brought them back. koji and gustav were handed in at an la police station on friday. lady gaga's dog—walker, ryan fischer, was shot in the incident on wednesday and suffered serious injuries. his family now say they expect him to make a full recovery. you can reach me on twitter. i'm @lvaughanjones. before we go, let's leave you with these images of the very nearly full moon rising over the pier in the south coast town of eastbourne here in the uk last night, and the spectacular sight of a commemoration of stylings. ——

murmuration. this is bbc news. hello, i haven't got the best weather memory but i would hazard a guess that this is going to be one of the quieter weather weekends of the year so far. that's no bad thing. barely any rain out there, some occasional sunshine, fairly chilly at night. frost, fog a possibility, but it is all very quiet with high pressure right across us, just one weak weather front moving into that area of high pressure and that just lingers with a bit of cloud as we go through the weekend, barely any rain left with it by saturday morning but the cloud will have kept temperatures up overnight and into the morning through parts of scotland and northern ireland. it's eastern scotland, more especially in england and wales with the frost, maybe down to “i! or —5 in the coldest parts of southern england in the countryside, a few fog patches, parts of wales,

west midlands and south—west england gradually clearing. and still maybe a bit of light rain to parts of northern ireland and southern scotland but that will tend to fizzle out and bring just a bit more cloud further south into parts of northern england during the day. elsewhere, well, there will be some areas of cloud around but there will be sunny spells, too and temperatures to several degrees above the average for the end of february. still, that strip of thicker cloud across parts of northern england and northern ireland, the odd spot of drizzle perhaps overnight and into sunday. away from that will be some areas of cloud, some clear spells, a few fog patches around, but not widely as clear as friday night and into saturday morning, so that means the frost isn't going to be as widespread. so, just pockets of frost on sunday morning, some fog patches gradually clearing. still from that decaying weather front, that strip of thicker cloud from northern england into northern ireland, there could be a stray shower. though the vast majority will have a dry day. again, with some cloud but also some sunny spells. and for the most part winds are light, quite breezy

in north—west scotland and windier towards the south coast of england into south—west england and south wales on sunday, where it's likely to feel a little bit cooler and generally temperatures are just a degree or two down on sunday. now, there's a greater chance of more widespread mist and fog as monday begins. it will make for a colder day, especially on monday where that fails to clear. but high pressure's still around for much if not all of next week. just a little weather disturbance running up across western parts on tuesday may bring a few showers, but that'll be the extent of it. and after briefly colder at the start of the week, temperatures head up again before it turns a bit colder again later in the week.

this is bbc news. the headlines: a us intelligence report says the saudi crown prince approved a plan to capture or kill the dissidentjournalist jamal khashoggi in 2018. the report said the conclusion was based on the crown prince's willingness to use violence to silence critics. saudi arabia has dismissed the american claims. the nigerian president says his government won't give in to blackmail after more than 300 schoolgirls were kidnapped. he described those behind the latest abductions in zamfara state as bandits and said they should not interpret the government's restraint as a sign of weakness. the us president, joe biden, has traveled to texas to see how the state is recovering from the freezing weather that left millions without power or clean water. mr and mrs biden worked with volunteers at a houston food bank and toured a covid—19 vaccines centre.

here in the uk, the former first minister of scotland alex