this is bbc news. i'm lewis vaughan jones. our top stories: a police officer dies after being rammed by a car outside the us capitol building in washington. another officer is being treated in hospital. the suspect who emerged from the car with a knife and ran at officers was shot and died in hospital. the suspect did start lunging toward us capitol police officers, at which time us capitol police officers fired upon the suspect. the top homicide investigator for the us city of minneapolis gives evidence on day five of the trial into the alleged murder of george floyd. remaining calm under the pressure: the life—saving operation that took place while a fire was raging.

and the show might go on: more than a year after closing their doors, the theatres of broadway partially re—open. hello and welcome to bbc news. a police officer has died and another is in hospital after an attack on the us capitol. a man carrying a knife rammed a car into a barricade before he was shot dead by police. president biden said he was heartbroken over the death of the officer. it's the second time the capitol has been targeted this year, after supporters of donald trump stormed the building in january. here's our north america editorjon sopel. sirens wail. we've been here before.

lunchtime on a cold easter day and another emergency at the capitol. sirens wail. a man in a blue car rams two us capitol police officers near a barrier. as he gets out of his vehicle, knife in hand, he's shot and has now died. immediately, congress goes into lockdown. a helicopter�*s summoned and lands in front of the capitol building. and the national guard, which has been on duty since the capitol riots ofjanuary 6, is mobilised. another terrifying moment for those who work in the congressional offices. at a hastily organised news conference, confirmation that one of the police officers has died as well. and it is with a very, very heavy heart that i announce one of our officers has succumbed to his injuries. but the assailant doesn't seem to have been on anyone�*s radar screens, and police are saying there doesn't seem to be an ongoing threat.

it does not appear that he is known to the capitol police or the metropolitan police department at this time. sir? is this a terrorism—related incident? _ it does not appear to be terrorism—related, but obviously, we'll continue to investigate to see if there's some type of nexus along those lines. it was only a few days ago that some of the intense security around the capitol, following january's shocking assault, was eased. just a week ago, the driver wouldn't have been able to get as close to the building as he did. what's happened today may be totally unrelated to the events of january 6, but there's a terrible sense of deja vu, a further heightening of the feeling of vulnerability. and once again, above america's august and imposing capitol building, flags have been ordered to fly at half—staff.

jon sopel, bbc news, at the capitol. barbara plett usher, our us state department correspondent, is outside the us capitol. over the past weeks, i think the city had begun to relax a bit more because since january 6, there'd been a massive security increase around the capitol building, as you know. there had been some warnings about possible attacks, but nothing had happened. and now something has, so people are on edge again and nervous about what to expect. now, this is nothing like on the scale, of course, of what happened onjanuary 6 — which was a mob storming the capitol building with arms, hunting down congresspeople, attacking police officers. this seems to be a one—man attack. at this point, it appears that he acted alone. it's also not at all clear that he might be, you know, connected to some kind of political or other cause. the officers who spoke to us earlier said that they were not calling it a terrorist attack and this man has not appeared

on law enforcement radar before, he's not known to police, so it's not clear what his motivation was. that will obviously be a big part of the investigation but, yes, it has rattled people to come three months afterjanuary 6, and some of the congressional aides that the bbc spoke to said that did make them nervous, especially with the security around, that another attack could happen. we can now speak to tracy walder who's a former cia officer and fbi special agent with experience in dealing with domestic terrorism and other home—grown attacks. thank you very much for coming on the programme. the first thing we should do is reflect on the fact that an officer who got up and went to work today is now not going home and we should not lose sight of that first of all.— first of all. absolutely not. he was with _ first of all. absolutely not. he was with the _ first of all. absolutely not. he was with the capitol- first of all. absolutely not. i he was with the capitol police from almost 18 years and really gave such a tremendous amount of his life to service and we should all be very grateful for that. , ., , ., that. given the details, not very many _ that. given the details, not very many details, - that. given the details, not very many details, but - that. given the details, not. very many details, but given those details we have so far,

what kind of thing do you think the investigation will be looking at now?- the investigation will be looking at now? one of the thins i looking at now? one of the things i do _ looking at now? one of the things i do think _ looking at now? one of the things i do think they - looking at now? one of the things i do think they will l looking at now? one of the| things i do think they will be looking at is clearly emotive. the suspect�*s name is noah greene and it come out through his social media that he had ties to the nation of islam which, through our southern poverty law centre here in the united states, is listed as a known hate group. so i think they will be looking at but in terms of motive and i think they will also be thought of broadening out their reach in terms of who they are going to look at, what kind of lists they are going to start putting people on. i think sometimes we brand terra is looking some way or believing a certain ideology and i think perhaps this is a wake—up call that it comes in all different shapes and sizes —— terra. all different shapes and sizes -- terra-— all different shapes and sizes --terra.~ , ., , ,, ., -- terra. we should stress that those details _ -- terra. we should stress that those details are _ -- terra. we should stress that those details are not _ -- terra. we should stress that those details are not yet - those details are not yet official. —— terror. we're

looking at pictures as we speak of the incident, the car or how close, orfaryour of the incident, the car or how close, or far your perspective, it got to the capitol building so what do you make of the level of security around the building right now. i’m level of security around the building right now.- level of security around the building right now. i'm a bit surprised- _ building right now. i'm a bit surprised. it _ building right now. i'm a bit surprised. it looks - building right now. i'm a bit surprised. it looks like - building right now. i'm a bit surprised. it looks like it. surprised. it looks like it came through the north constitution entrance, barricaded section. from what i understand, sections had been removed and he was able to get, in my professional opinion, a little too close for my comfort. but i think it's difficult here in america, you know, before september 11 i don't think americans would have accepted the level of security that we currently have now at airport and i'm not sure they would have accepted sort of a larger perimeter as you have mentioned before, and there were calls to take down there were calls to take down the barricades and take down those fences and send home a national guard so i think our

tolerance here for fortifying things and for enhanced security is sometimes quite low and i do think they need to be a larger perimeter and i do think he was able to get a little bit too close for my comfort. little bit too close for my comfort-— comfort. that's really interesting _ comfort. that's really interesting and - comfort. that's really interesting and it - comfort. that's really i interesting and it feeds comfort. that's really - interesting and it feeds into my last question, which is about the symbolism i suppose of this. this incident in itself, just the location and the timing means it hits people right across america. very acutely. right across america. very acutel . ~ right across america. very acutely-— right across america. very acutel. ~ ~ ., acutely. so, i think, you know, that is the _ acutely. so, i think, you know, that is the cradle _ acutely. so, i think, you know, that is the cradle of _ acutely. so, i think, you know, that is the cradle of our - that is the cradle of our democracy, right? capitol hill is something i would say most people over the world really associated with america and with our sense of freedom and democracy and when you have someone that specifically goes after those sorts of landmarks, in my opinion, they are trying to make a statement and again, we don't know what the motive is but to select a capitol building really is making a statement to the american

people that perhaps there democracy is not safe and perhaps the people that they elect to enhance that democracy are not safe either. find elect to enhance that democracy are not safe either.— are not safe either. and that can be very _ are not safe either. and that can be very unsettling. - are not safe either. and thatj can be very unsettling. tracy walder, great to have you and your expertise on.— your expertise on. thank you. thank yon — a minneapolis homicide investigator has said police officer derek chauvin used "totally unnecessary" deadly force when kneeling on george floyd's neck during an arrest last may. he was giving evidence on day 5 of the trial of mr chauvin the white former officer accused of killing mr floyd. here's a bit of what lieutenant richard zimmerman had to say, responding to questions from the prosecution. what is your, you know, your view of that use of force during that totally unnecessary. what do you mean? well, first of all, what do you mean? well, first of all. pulling _ what do you mean? well, first of all, pulling him _ what do you mean? well, first of all, pulling him down - what do you mean? well, first of all, pulling him down to - what do you mean? well, first of all, pulling him down to the | of all, pulling him down to the

ground — of all, pulling him down to the ground facedown and putting your— ground facedown and putting your knee on a neck for that amount— your knee on a neck for that amount of— your knee on a neck for that amount of — that amount of time, — amount of — that amount of time, it's— amount of — that amount of time, it'sjust uncalled for. i saw— time, it'sjust uncalled for. i saw no _ time, it'sjust uncalled for. i saw no reason why the officers felt they— saw no reason why the officers felt they were in danger, if that's_ felt they were in danger, if that's what they felt. and thads— that's what they felt. and that's what they felt. and that's what they felt. and that's what they would have to have _ that's what they would have to have felt — that's what they would have to have felt to be able to use that — have felt to be able to use that kind of force. our correspondent lebo diseko is in minneapolis and has been watching the trial. today has been very much about the police response. lt zimmerman, one of the longest—serving and most respected officers here in minneapolis, telling the court that in his 35 years on this force in minneapolis, he has never been trained to kneel on someone's neck and that is because it constitutes deadly force. also talking about the fact that once somebody is in handcuffs, they no longer constitute the same level of threat. and really saying that as a police officer, you have a duty of care to somebody once they are

handcuffed, that their safety is your responsibility. our thanks to lebo diseko and just one quick bit of news from the us. major league baseball has announced it's moving its all—star game out of atlanta following the state of georgia's adoption of a new law that affects the right to vote. critics of the new legislation claim it makes it harder for black people and other minorities to vote in elections. the announcement comes a day after president biden called for the game, which was set to be at the home of the atlanta braves, to be rescheduled. the sport's commissioner said baseball supported voting rights for all americans. let's get some of the day's other news. officials from tehran and washington will travel to vienna next week as part of efforts with other world powers to revive the 2015 iranian nuclear deal. the us and iran are not expected to hold direct talks but russia has said the talks are on the right track.

the iran nuclear deal was scrapped by president trump's administration after he accused tehran of breaking the conditions. india's cricket legend sachin tendulkar has been hospitalised after testing positive to coronavirus earlier this week. the former captain said he had decided to go to a hospital in mumbai "as a matter of abundant precaution under medical advice", and he added that he was hoping to be back home in a few days. the japanese scientist isamu akasaki, who won a nobel prize for developing energy efficient led lighting, has died at the age of 92. professor akasaki was jointly awarded the prize for physics in 2014, along with two other scientists. the nobeljury described their invention of the blue light—emitting diode as "revolutionary". at least 50 people have been killed in a passenger train crash in taiwan. hundreds of others have been freed from the wreckage

after being trapped for hours. our correspondent john sudworth reports. the train, travelling south from taiwan's capital and along the island's mountainous east coast, was packed with people ahead of what is a long holiday weekend here. just as it was entering a tunnel, it's believed to have been derailed by a lorry that slipped onto the track from a nearby construction site. rescuers worked to free those trapped in carriages ripped apart by the impact. reports suggest that, with almost 500 people on board, many had been standing up. "the lorry slid off the road and crashed into the train," this worker says. "now all of the front carriages are damaged." some passengers were able to walk to safety but the mangled

wreckage blocking the inside of the tunnel meant others had to use the roof of the train to escape. ambulances ferried dozens of injured people to local hospitals. "i was thrown to the floor. i hit my head, and it started bleeding," this woman says. "there was no space on the sides of the tunnel. we had to climb onto the carriage roof to get out." taiwan's premier, su tseng—chang, visited the scene, while family members gathered to identify the dead. and the scale of the loss of life left a profound sense of shock on a national holiday meant to be a time that brings loved ones together. the president tsai ing—wen described it as "heartbreaking". the islands state—owned railway network, while reliable and efficient, has suffered a small number of fatal accidents over the years. this is being described

as the worst in decades. john sudworth, bbc news, taipei. this is bbc news, the latest headlines: police guarding the capitol building in washington have shot and killed a man who drove his car into two police officers. one of the officers has died. a minneapolis homicide investigator has said police officer, derek chauvin, used "totally unnecessary" deadly force when kneeling on george floyd's neck during an arrest last may. to new york now, where the city's famous broadway theatres, art and entertainment venues are beginning to reopen with limited visitor numbers. theatres have been closed as the city battled against the covid pandemic, but from friday, they are allowed to reopen at 33% capacity. new york city's mayor, bill de blasio, says he's keen to get theatres back up

and running again with a full reopening by the end of 2021. daniel dunlow is the director of programming for the green room 42, one of the first three venues in new york to reopen this weekend. 04 q4 coming on the programme. thank you for having me. haunt q4 coming on the programme. thank you for having me. how do ou feel thank you for having me. how do you feel about — thank you for having me. how do you feel about this _ thank you for having me. how do you feel about this partial - you feel about this partial reopening? it you feel about this partial reopening?— you feel about this partial reoeninu? , , . reopening? it is very exciting, it is a step _ reopening? it is very exciting, it is a step forward _ reopening? it is very exciting, it is a step forward but - reopening? it is very exciting, it is a step forward but we - it is a step forward but we definitely need as an industry, it is a step that we need is a city to be honest, it is part of the heartbeat of new york city and we have a little bit of back tonight.— of back tonight. the little heartbeat _ of back tonight. the little heartbeat back _ of back tonight. the little heartbeat back which - of back tonight. the little heartbeat back which is i of back tonight. the little - heartbeat back which is great but making money is the problem, isn't it, you need those full capacities, you need those full capacities, you need those bums on seats and you cannot quite get that yet. yeah, you just have to get creative. it is the new economy of the new world, the new way of the new world, the new way of doing business, and we have found a way to at least do bear business by the customer, by

the artist, and hopefully you know, make some money along the way. know, make some money along the wa . ., , y know, make some money along the wa . ., , , ., ~ know, make some money along the wa. , ., y way. hopefully make some money alon: the way. hopefully make some money along the way _ way. hopefully make some money along the way to _ way. hopefully make some money along the way to keep _ way. hopefully make some money along the way to keep the - along the way to keep the long—term prospects of the business going. just remind us, how has it been for you guys, when everything has been closed and theatres are empty, how have you been surviving? every week it was _ have you been surviving? every week it was replanning, - have you been surviving? every week it was replanning, if- have you been surviving? every week it was replanning, if they | week it was replanning, if they gave us the green light at the beginning of next week, what would we do? every week for this entire shut down we were coming up with a new plan and a revived plan, revived one, a revival. finally we got the green light but from a financial perspective, it is just a waiting game, is hanging on by the same thread that every new yorker was hanging on, and honestly, like, i don't think the new york art community could have waited any longer. if other venues were in the same position, i know that it is dire out there, we really needed and are thankful for the opportunity to do shows again. that is really interesting. where do you see yourselves

then, take the summer, do you think you will be up increasing capacity more shows up and running by then? i capacity more shows up and running by then? i definitely thinkthat — running by then? i definitely think that with _ running by then? i definitely think that with the _ running by then? i definitely think that with the proven i think that with the proven success of what tonight has been here, what we will be in the future, the city will take steps to increase the 33% to 50%, to 65% and maybe even, let us serve drinks during the show, that is phase three, four may be down the road. we are just hoping that our capacity will increase and with that will come bigger theatres, and then hopefully the broadway theatres. . ., then hopefully the broadway theatres. , ., ., ., then hopefully the broadway theatres. ., ., ., then hopefully the broadway theatres. ., ., . ., theatres. great to have you on, lookin: theatres. great to have you on, looking forward _ theatres. great to have you on, looking forward to _ theatres. great to have you on, looking forward to the - theatres. great to have you on, | looking forward to the weekend, break a leg. looking forward to the weekend, break a leg-— the netherlands is suspending the use of the astrazeneca coronavirus vaccine for people under the age of 60, as a precautionary measure. it follows five reports of cases of blood clots in women who'd been vaccinated,

out of a total of 400,000 people who've been given the jab. one of the women died. germany took a similar step on tuesday. meanwhile the uk's medical regulator revealed there have been 30 cases of rare blood clotting in people who've had the oxford—astrazeneca jab and seven people have died. that's out of a total of 18 million administered doses in the uk. our science correspondent rebecca morelle explains more. these clots are unusual in that they're associated with low platelet levels, and platelets are a type of blood cell that normally cause bleeding, not clotting, and these clots can affect the brain, too. so, what needs to be unpicked is whether these are happening naturally or whether they're a really rare reaction to the astrazeneca jab. the incidence is low, so 30 cases out of 18 million jobs. so that's about one event in every 600,000 astrazeneca vaccines. and the uk regulator said there have been two cases of brain blood clots

with the pfizer vaccine, too, but these don't have the low platelet counts associated with them, so they're slightly different. but these clots have caused some countries to actually restrict who they give the vaccine to. so, today, the netherlands has announced that it's not going to be giving the astrazeneca jab to people under the age of 60. germany are doing the same thing, too, but the uk is continuing with its vaccine roll—out. and the uk regulator stresses, along with the european medicines agency and the world health organization, that the benefits of having a vaccination and the protection that they offer from coronavirus far, far outweigh any potential risk. so, their message is, if you are offered the vaccination, to go ahead and take up that offer. pakistan is among four countries which have been added to england's "red list" of places from where almost all travel is banned. from next friday, only british and irish nationals, or uk residents, will be allowed to return home from

pakistan, bangladesh, the philippines, and kenya. they'll have to self isolate for 10 days in a government—approved hotel. russian state media have released a series of videos which apparently show opposition figure alexei navalny in a detention facility in order to discredit him. two days after the putin critic declared a hunger strike, pro—kremlin media published clips of him walking without a limp, to dispute claims mr navalny is suffering from back and leg pain. mr navalny began his hunger strike, saying he'd been refused access to a civilian doctor and that the russian penal colony is a torture facility. a russian medical team has successfully completed open heart surgery on a patient, as firefighters battled to control a serious blaze at a hospital in the far—eastern city of blagoveshchensk. the leader of the heart unit said his team had to do everything to save their patient.

gareth barlow reports. as smoke billowed out of the building, firefighters rushed in. emergency services scrambled to evacuate more than 120 patients being treated at the tsarist—era hospital. amid the chaos, one team of medics valiantly carried on. eight doctors and nurses performed a two—hour open heart operation. with electricity cut by the fire, an emergency power cable was fed into the building to keep vital life—support systems operational. translation: when smoke came in, we installed special electric fire brigade fans to evacuate the smoke from the first floor and from the operation room. the operation was a success, and the patient safely transferred to another unit. no one was injured by the fire. however, the impact of the blaze will be keenly felt as the hospital

is the only in the region with a specialist heart unit. all around the world, despite the global pandemic, millions of people will be marking the easter holiday. it is of course one of the most important dates in the christian calendar — but plenty of non—believers will be celebrating too. for them it's more about confection than resurrection — as the bbc�*s tim allman explains. the easter bunny gets everywhere these days. here he is underwater, off the florida keys. well, actually, this is captain spencer's late, a local scuba—diving operator. he is setting up a somewhat aquatica easter egg hunt. it is all in a good cause, raising money for local children in need. and in case you're wondering, all the eggs have non—toxic colouring and environmentally friendly. speaking of eggs, take a look

at these. in hungary, there is at these. in hungary, there is a long easter tradition of decorating them, intricate designs, delicate paintwork. little overall works of art. —— oval. little overall works of art. -- oval. . ,, �* little overall works of art. -- oval. . ,, . ;;:: oval. translation: over 30 ears i oval. translation: over 30 years i have _ oval. translation: over 30 years i have got _ oval. translation: over 30 years i have got to _ oval. translation: over 30 years i have got to know - oval. translation: over 30 years i have got to know the | years i have got to know the 999 years i have got to know the egg as a material to work with. it may be very thin but it is still malleable, so we know each other, the egg and i, me and the egg. each other, the egg and i, me and the egg-— and the egg. these eggs at london zoo _ and the egg. these eggs at london zoo are _ and the egg. these eggs at london zoo are not - and the egg. these eggs at london zoo are not quite i and the egg. these eggs at| london zoo are not quite as impressive but they do their job. every year, treats are hidden away by the keepers and the monkeys go looking for them. and notjust the monkeys— them. and notjust the monkeys— the meerkats also like to get involved. across the other side of the world, a similar story at this park in new south wales. the local wildlife getting into the swing of things. although this koala still prefers eucalyptus leaves to easter eggs.

before i go, here are some pictures of the tokyo 2020 olympic torch that has been making its way through japan's central nagano prefecture on friday. the torch would normally then be carried to the more western city of osaka, but authorities there are set to discuss plans with the 2020 tokyo games organisers to cancel that leg of the torch relay, due to the region's covid restrictions. the 121—day relay is seen as the first major test of olympic organisers' ability to hold a large event under strict coronavirus curbs. 10,000 runners carry the torch through 47 prefectures. a quick reminder of our top story now. a police officer has been killed in an attack near the us capitol building in washington after a man drove his car into two offices before getting out of the building and lunging at them with a knife. the man was then shot dead by police. that's it from me, get

me online anytime, i am on twitter at lvaughanjones. this is bbc news, goodbye. hello there. it's likely to be a dry day for most of the united kingdom today, but there will be contrasts. where we keep the cloud as we had yesterday, temperatures will be held into high single figures, but in the sunshine, potentially 14—15. now, under the starry skies, that's where we see the frost as we start this saturday morning, but you can see the thicker cloud across northern scotland, central and eastern england, perhaps east wales. and there could also be a little bit of mist and fog where we've kept the clear skies as well. but the day is likely to give us quite a bit of cloud across central and eastern areas. it's likely to lift a little as we go through the day and the skies brighten. similarly so across northern scotland, we keep quite a bit. for the likes of lincolnshire, east anglia and the south east, though, it could remain overcast all day. and with that keen breeze

still quite gusty through the channel, only eights and nines, but 13—15 in the sunnier spells. now, as we go through the evening and overnight, we tend to thicken our cloud in the north, but under the starry skies elsewhere, again we can expect a touch of frost. but you may have noticed the approach of some rain for the north of scotland, and that's the start of the transition to much colder air. it's this particular weather front here, as you can see, and behind it, there's arctic air following. so, we are going to have another blast of cold air as we head through in towards easter monday, but for sunday, easter day, a little bit of mist and fog around. actually, we should see a bit more sunshine for england and wales, but cloudier skies with rain for scotland followed by snow and cloudier skies for northern ireland. eventually, we'll see some of that wet weather coming in through the afternoon. but notice the temperatures. we've lost that keen north—easterly. they're a little bit higher temporarily. but overnight sunday into monday, that weather front introduces that colder air right the way across the uk, an arctic blast for all of us. and notjust the cold air, but a strong to gale—force north wind, as well, which will accentuate the chill. clearly, the showers are quite prevalent for northern

scotland, but they may well work their way down through the irish sea, down the east coast of both england and scotland as well. but there should be some sunshine between, but itjust will feel much colder, more like winter. these are the temperatures on the thermometer, but you add on that wind—chill, and it will feel significantly colder. so, big changes afoot, and that may well last into the start of the new week into tuesday, as well, as you can see. as ever, you can keep up to date on the weather on the website. that's where all the warnings are. bye— bye.

this is bbc news. the headlines:

a police officer has been killed in an attack near the us capitol building in washington after a man drove his car into two officers, before getting out of the vehicle and lunging at them with a knife. the man was then shot by police. he later died. the top homicide investigator for minneapolis has told the murder trial of derek chauvin, the former white police officer who was seen last year kneeling on the neck of the george floyd, the use of force was "totally unnecessary." mr chauvin denies the charges against him. at least 50 people have been killed in a passenger train crash in taiwan. after being trapped for hours. the train derailed as it was emerging from a tunnel, apparently after a maintenance vehicle slid onto the tracks. now it's time for click.