this is bbc world news. i'm duncan golestani. our top stories: at least 15 palestinians are reported killed and hundreds injured as israeli security forces confront protesters along the gaza border. summoned to the ministry — western ambassadors are called in by russia as tit for tat expulsions continue in moscow over the poisoned spy. fresh controversy for facebook as an old memo emerges saying anything it did to connect people was good — even if it led to a death. searching for the next breakthrough in computing — scientists believe they may have found a way to supercharge the processing of data. we can begin to solve problems that would take us more than it would ta ke would take us more than it would take us . seconds. the more than the. -- more

or days. the more than the. -- more than the. hello and welcome to bbc world news. thousands of palestinians in gaza have marched on the israeli border at the start of a six—week protest. they're demanding that some residents be allowed to return to homes that are now in israel. at least 15 palestinians have been killed and a reported 1000 wounded in clashes with the israeli defence force. that's according to the palestinian health ministry. a 16—year—old boy is said to be among the dead. the israeli military oversees a no—go zone along the gaza border, citing security concerns. palestinians have pitched five camps near the border — seen here in yellow. israel has deployed tanks and snipers and is using tear gas to force palestinians away. the bbc‘s yolande knell is injerusalem a chaotic rush to the hospital,

with hundreds of palestinians injured in gaza. a call for peaceful marches turned to violence, as protesters headed towards the israeli border. israel's military says it used tear gas and opened fire to stop anyone illegally crossing into its territory or attacking soldiers. and this was just the start. palestinians are planning a series of protests until mid—may. that will be 70 years on from the creation of the state of israel. palestinians see it as their catastrophe, when hundreds of thousands of people fled their homes, and many here have never given up their claim to the land. translation: we are here to stress our right to return. sooner or later, we must go back. but israel says gaza's leaders are cynically exploiting ordinary people to stir up unrest.

translation: hamas and other palestinian groups are calling their protest "the march of return". however, as events unfold, it's the march of chaos. these are aggressive riots. gazan families are now being urged to stay at protest camps along the israeli border, and that will ensure that tensions here remain high in the weeks ahead. yolande knell, bbc news, jerusalem. the palestinian president, mahmoud abbas, has said israel is responsible for the fifteen deaths. in a televised statement, mr abbas called on the un to intervene. translation: are, faced with the sad events, please full responsibility on the israeli authorities following the firing of the obligation of army against the popular and peaceful protests which came out to commemorate this anniversary, and to

ta ke commemorate this anniversary, and to take back its right and self determination like other countries around the world. —— i, faced. i've asked the united nations today for immediate action to provide international protection for our palestinian people facing this continuous and escalating daily aggression. a spokesman for the israeli prime minister tweeted "hamas terrorists send thousands of palestinians, some armed, to cross the border fence between gaza and israel in order to infiltrate our lands and kill our citizens. every country has the right to defend its borders and people from a brutal, terrorist organisation." that was a tweet from a spokesman for the israeli prime minister. and you can find much more on this story on our website — including analysis of the palestinian group hamas. just log on to bbc.com/news. let's move on, now. in an afternoon of tit—for—tat diplomatic expulsions after the salisbury nerve agent

attack, russia has sent home dozens of embassy staff from 23 different countries. and it says it reserves the right to take action against a further four. in the past hour france has confirmed that four of its diplomats have been expelled too. russia has also given britain one month to cut its diplomatic contingent in moscow to the same size as the russian diplomatic mission to britain. from moscow, sarah rainsford reports. it was quite a sight. a stream of ambassadors summoned to russia's foreign ministry. they came from more than 20 countries to hear their punishment. each one had backed britain and accused russia of the nerve agent attack in salisbury. the german ambassador emerged to say moscow still has questions to answer over the poisoning. but his country is now losing four diplomats here. in total, well over 100 willjoin a mass exodus from moscow. there have been extraordinary scenes here all day, as, one by one, ambassadors have been called in to the foreign ministry.

the timing of this, the choreography, seemed meant to send a message — that russia will hit back at any moves made against it by western governments. and today moscow decided to escalate. the british ambassador was summoned again, ordered to cut his staff even further. it's important to bear in mind why this crisis has arisen in the first place. it is the use of chemical weapons on the streets of the united kingdom that has threatened the lives of a number of people in my country. 23 british diplomats have already left this embassy. now the uk has the match its total diplomatic presence here to the russian headcount in the uk. this move is a clear sign that vladimir putin is determined not to give in under pressure. expulsions look so easy, you don't have to pay a high price on either side for expulsions, but it is not the case. i'm afraid if the whole fabric of the relationship

gets thinner and thinner, we have a real problem. but that problem is already here. western countries seem determined to show russia it has crossed the line, but the kremlin still calls the accusations against it outrageous and warns that further sanctions could follow. sarah rainsford, bbc news, moscow. the diplomatic row between the uk and russia has taken another turn on friday evening here in london, with the russian embassy saying that british officials searched an aeroflot plane at heathrow airport. it says uk border force and customs 0fficers boarded a flight which was due to fly to moscow. a statement claims the officials wanted to search the plane without any crew present, and gave no reasons for their actions. it adds that embassy staff have sent a diplomatic note demanding an explanation. and it describes the events as ‘connected with the hostile policy that the uk government

is conducting with regard to russia.‘ the british government has not yet commented on those claims, but earlier it did confirm that customs officers had boarded a plane in london, without saying whose aircraft it was. let's take a look at some of the other stories making the news. the united nations security council has imposed new penalties on companies accused of helping north korea to evade international sanctions. 2i shipping companies and one individual are to be blacklisted for their role in helping pyongyang to continue to illegally import oil and sell coal. us media are reporting that arnold schwarzenegger is in a stable condition after undergoing emergency open—heart surgery. the 70—year—old actor and former california governor was in hospital to have a routine heart operation and developed complications. all departing flights from london's third largest airport,

stansted, have been cancelled and passengers asked to leave, after a bus caught fire outside the terminal. 0fficials apologised and advised passengers to re—book their flights. no injuries were been reported. it's thought the fire had been caused by an engine electrical fault on the bus. an independent autopsy on the body of a young black american, stephon clark — who was shot dead by police — has found that seven of his eight gunshot wounds were in the back or the side. a lawyer for his family said this contradicted the police's version of events. lebo diseko has more. remembering stephon clark, a community demanding justice for the 22—year—old father of two, killed by police gunfire. as they gathered for his funeral, mourners demanding a nswe i’s. his funeral, mourners demanding answers. it isjust happening over

and over and over again. and it has to stop. he wasjust in his grandmother's backyard. and i feel that people should not be scared of being in their backyard. there is definitely something wrong with the concept of a black man in the eyes of the police. it appears that we are a threat. these are the moments just before stephon clark was shot dead. it was filmed by police, who say that they were responding to reports of break—ins in the area. moments later, he was shot dead in his grandmother's backyard. police said at the time the 20 —— that 20 shots were fired. police officers also said he appeared to be carrying also said he appeared to be carrying a gun. but no weapon was found in him, justa a gun. but no weapon was found in him, just a cellphone. and they said that he was coming towards them. but an independent autopsy has given a

different finding. he was shot in the back six times. the seventh gunshot wound was slightly to the side of his body. it takes the brain about 3—5 minutes, all at pre—io minutes to suffer are —— all 3— ten minutes to suffer are —— all 3— ten minutes to suffer are —— all 3— ten minutes to die. so was not instantaneous. this is unlikely to ease the anger in the community. police say they cannot comment while an investigation is being carried out. but stephon clark's families as the autopsy shows he did not pose a threat. instead, their lawyer says it is another senseless police killing under increasingly questionable circumstances. lebo diseko, bbc news. mark zuckerberg, the chief executive of facebook, says he strongly disagrees

with a leaked memo from 2016, written by a top executive at the company. the memo described what it called the "ugly truth" — that anything it did to grow facebook was justified. it was first published by the buzzfeed news website. in the leaked memo andrew bosworth apparently wrote that connecting people can be bad if they make it negative. maybe, he writes, it costs a life by exposing someone to bullies, or someone dies in a terrorist attack coordinated on our tools. he goes on to say that "we will still connect people," and "anything that allows us to connect more people more often is de facto good." the story was broken by ryan mac from buzzfeed news. here's what he had to say about it. it was a post sent to employees only. as i understand it, there was quite a bit of debate in the comments section as well that post. it caused quite a stirk, i believe,

and a lot of people did not agree with that, even at the time it was posted within the company. what is interesting about this memo is that for so long facebook has said that facebook is really the best place for people to connect to —— people to connect —— people to connect, the whole world connect. but they do not deal with the bad things that happen on their platform. this shows that they work thing about those things backin they work thing about those things back in june 2016, they work thing about those things back injune 2016, that fundamentally bad things, whether thatis fundamentally bad things, whether that is the organisation of terrorism plots, or suicides by bullying, could happen on its platform. it is quite telling. facebook, like a lot of technology companies, has a culture that frowns upon leaks, companies, has a culture that frowns upon lea ks, frowns companies, has a culture that frowns upon leaks, frowns upon internal information getting out into the public, and these cultures are very

protective of what they say internally, and they have kind of bread their employees to act in certain ways. but this is one of the first cracks that we have seen in facebook‘s armah in sometime. you do to get the kind of blunders publicly from a lot of facebook or technology executives in general. most people here think that technology is a force for good. and they will say that publicly over and over and over again. it really get that that technology can also, just as much bad can come from the good. and that is what was i opening. the idea that facebook, again, could be used for organising terrorism plots was quite alarming to me. stay with us on bbc world news, still to come... 220,000 people from el salvador are facing deportation from the us next year. we've got a report on those that have already returned and the challenges they face.

the accident that happened here was of the sort that can, at worse, produce a meltdown. in this case, the precautions worked but they didn't work quite well enough to prevent some old fears about the safety features of these stations from resurfacing. the republic of ireland has become the first country in the world to ban smoking in the workplace. from today, anyone lighting up in offices, businesses, clubs or restaurants will face a heavy fine. the president was on his way out of the washington hilton hotel where he had been addressing a trade union conference. the small crowd outside included his assailant. it has become a symbol of paris. a hundred years ago, many parisians wished it had never been built. the eiffel tower's birthday is being marked by a re—enactment

of the first ascent by gustave eiffel. this is bbc news. the latest headlines: at least 15 palestinians are reported killed and hundreds injured as israeli security forces confront protesters along the gaza border. in an afternoon of tit—for—tat diplomatic expulsions after the salisbury nerve agent attack, russia has sent home dozens of embassy staff from 23 different countries. scientists say it's the technology that could revolutionise computing. it's called quantum computing and for years companies have been vying to build a fully operational quantum computer, which could process information much faster than today's most powerful super—computers. now scientists at microsoft say they're on the verge

of a major breakthrough. our technology correspondent rory cellan—jones explains. copenhagen, and it's pretty cold outside, but inside a university lab, there's a place that's even colder. if you look right up here on this gauge, you'll see that the inside of that refrigerator is sitting at three hundredths of a degree above absolute zero. that's 100 times colder than deep space. this may be the coldest place in the universe. and this is why. embedded in this chip is a qubit, the building block for the computer of the future, which will only work under these extreme conditions. microsoft is working with scientists here and around the world to build a quantum computer. they're confident they're about to make a major breakthrough. if they succeed, there's a huge prize. quantum really represents a giant leap forward from today's technology. we can begin to solve problems that would take us today more than a lifetime of the universe to solve, in seconds,

hours or days. so how does a quantum computer work? drill down into a conventional computer and you'll find the bit, the basic unit of information, which is either a zero or a one. think of it as a switch which is either on or off. but at the heart of a quantum computer is the qubit, and the magic here is it can be both one and zero at the same time. the switch can be both on and off. this supercharges any computer programme, making impossible problems easy to solve. we could find answers to climate change, make rapid progress in artificial intelligence, and break encryption — secure codes would be simple to crack. first, though, there are huge challenges in creating qubits stable enough to be useful in a commercial quantum computer. microsoft thinks it's got a unique way of doing that. by making a better qubit to begin with, you'll need fewer of them to build the full quantum processor.

but there's stiff competition. google, ibm and scientists in labs like this one in london are all making breakthroughs, and so far they've made faster progress. so microsoft is starting further behind, they're still trying to demonstrate a single qubit, but their approach is unique. its qubits may be much better protected against errors, so if they get their one qubit to work, they could leapfrog these other approaches quite quickly. back in copenhagen, they're confident they're on the verge of a breakthrough which will lead to a commercial quantum computer within five years. if that's true, and it's a big if, the world will change in all sorts of ways. the trump administration recently announced it will lift "temporary protected status" or tps for around 220,000 people from el salvador next year, who will then face deportation from the us. with limited support networks

in place, el salvador is already struggling to cope with so many deportees. will grant reports. the trump administration says it has sent these deportees home. but for many, home was the united states. they met with a little kindness. a meal, a chance to call family, medical attention. they are reunited with their possessions removed from them in us detention centres. the most basic to the most cherished. these are the first steps of rebuilding their lives in el salvador. a country some left a few months ago, but others haven't seen since they were small. jose luis ca nales has no since they were small. jose luis canales has no one in el salvador. instead he turned to the man he was shackled to on the plane. miguel angel canizales open his home and family toa

angel canizales open his home and family to a stranger, sharing what little they have. these people i only support, i had no to go. the situation is so bad and dangerous you can easily be killed. so when i arrived at the airport might only plan was to arrive —— go back to the us, through guatemala and mexico.- told me his story, that he was coming back to nothing and that he had no one to support him. sol coming back to nothing and that he had no one to support him. so i said look, i will help you, don't worry, somehow we will get by. they have found work through the church, but jose's predicament is common. many deportees return to hostile and unfamiliar surroundings, a place pleasure than trump recently described in the crudest terms. —— a place president trump. all editions in el salvador know that much is to be done to create conditions in the country to prevent the exodus. some are urging the trump administration to change its thinking and its language around immigrants. when you

have that kind of discourse, it you reinforce stereotypes, and you reinforced division and you reinforce, in many cases, it is essentially the politics of fear. still, the waves of deportees return, often having left children, espouses, homes and businesses behind. this man, maximo, hasn't set footin behind. this man, maximo, hasn't set foot in el salvador in 1a years. and his kids remain in the us. his family are glad to have him back, that he is lost, a stranger in the country he was born in. malala yousafzai, the youngest ever winner of the nobel peace prize, has told the bbc she hopes one day to move back to pakistan. she's currently on her first trip back there, after she was nearly killed by the pakistani taliban in 2012, for campaigning on behalf of girls' education. she was brought to britain for treatment and has been living here ever since. she spoke to our pakistan correspondent secunder kermani in the capital, islamabad. this was the last time

malala was in pakistan, fighting for her life after being shot by militants. after nearly six years, she's now back and says she still can't believe it. it is emotional. each and every thing i see, it is valuable to me. even just this warm air, i value it, and i'm enjoying it, and i am just so happy to be home and to put my feet on this land again. malala, though, has her critics in pakistan. many on social media accuse her of being a western agent. how does it feel when you read those kind of comments? firstly, ijust don't understand who, why do they oppose me and what is the reason behind it? i want a better future for this country. that's why i started speaking out for girls' education. that's why i did not fear anything, and i said

even if the terrorists attack me, it does not matter, i will continue speaking out. and it did happen, and i continued my campaign for girls' education. so my focus is only working for the good. it's 200 million people, and i know that 99%, more than 99% stand with me, support me, they believe in education, they believe in their daughters. yesterday, malala spoke at an event attended by the pakistani prime minister. but she says she doesn't have political ambitions herself. so when i was 11 or 12 and when there was extremism happening in swat valley, at that time i thought by becoming prime minister, i can solve every problem, and i will eradicate all these extremists, and everything would be fixed. but i think now i have met many leaders and politicians and prime ministers, and it seems it's not that simple. i think my focus right now is continuing my work through malala fund and making sure we reach out to as many girls as we can — and there are 130 million girls who cannot go to school right now — to ensure that they can

get quality education. i have no intention right now of politics. all around the world, christians have been marking good friday — the day whenjesus was crucified. pope francis led the events in rome, presiding over the way of the cross procession. a cross was carried around the colosseum — the roman stadium which is believed to have been the scene of many executions of christians in the early years of the church. this ceremony rates are suffering and crucifixion ofjesus as the catholic church prepares the easter. you're watching bbc news, stay with us. some parts of england had a washout

ofa some parts of england had a washout of a good friday, some areas in western scotland were babes in sunshine. those where the differences will continue as we go through the west of this weekend. there will be some rain around at times, snow, particularly easter monday as we will see in a moment. it is disappointingly cool but there are dry, sunny areas too. they will come in the day ahead, the further you are away from this area of low pressure. this brought some very wet weather for some of us during good friday but you are further away still in northern and western scotla nd still in northern and western scotland and northern ireland. so you will do quite well, but the eastern scotland into england and wales, you will get plenty of clout at there will still be some outbreaks of rain, some sleet and snow into the higher hills. but it is not as heavy, not as wet as it was during good friday, more of this will peter out later in the day. there will be some brightness developing in the south—west of england, western fringes of wales, to the western pennines, but

especially into northern ireland, north and west scotland. nowhere is particular warm and actually it is quite cold into north—east england, with a brisk breeze. a lot of that pack she wet weather will fade away during the night, into sunday morning. clearing skies into northern and western parts of britain will allow temperatures to give away into a touch of frost, there will be fog patches into sunday. but it is a better day on sunday, that is if —— on easter sunday, that is if —— on easter sunday, in between weather systems, it is the most widely dry day of this easter weekend. there will be a good deal of clout around, one or two showers to be had here and there, and some drizzle. but many places will be dry, a few breaks in the cloud here and there, maybe some developing through eastern parts of england. but expect a good deal of clout. and rain coming back to south—east england and southwest wales later in the day, we have seen a lot of rain here, so watch out for

potential problems from that. and from the rain and so pushing northwards into easter monday, because the moisture is feeding into cold air, sofa parts of wales and the midlands northwards, some sleet and so mainly on hills, but also possible and lower levels. the far north of scotland staying dry during daylight hours and in the southleigh brighten up a bit after some heavy showers. but it is a possibility of snow, and is a busy travel day on easter monday which we are watching closely. if you have travel plans keep across the forecast because there is a risk of some disruption and we will keep you updated on that. this is bbc news. the headlines: at least 15 palestinians have been killed by israeli forces during a mass protest on the border between gaza and israel. demonstrators have been hurling stones and are calling for refugees to be allowed to return to israel. russia has expelled diplomats

from several countries, in response to expulsions of its own staff, after the uk accused moscow of being behind the poisoning of a former spy and his daughter. the un security council has imposed new penalties on companies accused of helping north korea to evade international sanctions. 21 shipping companies and one individual have been affected. a facebook executive's memo from 2016 has emerged which says anything the company did to grow was justified, even if it meant people might die as a result of bullying or terrorism. facebook says it "strongly disagrees" with the sentiment. now on bbc news, weather world. the team discover how meteorology has helped to shape