videos have emerged in the united states of a police officer fatally shooting a black man as he lay face—down on the ground. and the desperate search for survivors in south africa. the president calls the flooding there a catastrophe of enormous proportions. welcome to our viewers on pbs in america and around the globe. russian state media are reporting that the most important ship in russia's black sea fleet, the moskva missile cruiser, has been badly damaged after ammunition on board blew up, causing a fire. the moskva is the flagship of russia's black sea fleet. quoting the russian defence ministry, interfax says the crew had all been evacuated and the cause of the fire was being investigated. earlier, a ukrainian official said the ship had been hit by two missiles, but this has not been confirmed. let's go to washington to speak to lieutenant colonel daniel davis, a senior fellow at the foreign policy think tank defense priorities. how significant is the damage to the flagship carrier? it how significant is the damage to the flagship carrier?- to the flagship carrier? it has to the flagship carrier? it has to be very — to the flagship carrier? it has to be very serious _ to the flagship carrier? it has to be very serious they - to be very serious they evacuated all the crew members. there are it had to be something very serious, not something you have to do simply they had to take some time, this is the second ship damaged in the war. there was a russian landing ship, in the city, it was also destroyed by the ukrainians. we still don't know whether this one was actually destroyed by the ukrainians or whether it was just another bad accident in the russian a —— may be but in any case this is a black eye on this because it was the flagship. if this because it was the flagship-— this because it was the flan-shi. , ., flagship. if you believe one side of the _ flagship. if you believe one side of the story _ flagship. if you believe one side of the story a - flagship. if you believe one side of the story a fire - flagship. if you believe one i side of the story a fire caused the ammunition stockpiles to explode in the 500 person crew evacuated, do those things sound likely to you? it’s sound likely to you? it's entirely _ sound likely to you? it's entirely possible, - sound likely to you? it�*s entirely possible, the russian navy has had problems with this over the years and they have a bad track record for this kind of things, not as rare as you might think. the fact that this comes here in the black sea, no ships have been there for quite some time now, even before the actual war kicked off, for it just to be sitting out there, it's a really bad thing for the russian navy, and boost, know what happens for the ukrainian side. ., , ., side. the other side of the sto is side. the other side of the story is ukrainian - side. the other side of the story is ukrainian missiles| story is ukrainian missiles caused that ammunition stockpiled to explode in the 500 plus crew struggling to be rescued. eitherway 500 plus crew struggling to be rescued. either way the cause doesn't really matter, either side can claim their side of the story, and that can affect morale elsewhere on the battlefield?— morale elsewhere on the battlefield? that's exactly ri . ht battlefield? that's exactly right you _ battlefield? that's exactly right you can _ battlefield? that's exactly right you can be _ battlefield? that's exactly right you can be sure - battlefield? that's exactly i right you can be sure no-one right you can be sure no—one ukraine will question the story and wonder if the ship burned up and wonder if the ship burned up on its own, they will view this is a very positive development, the real question is, probably they won't be asking, if the ukraine batteries took this out with their missiles, you would wonder why they waited this long and why aren't they firing more because there are a number of ships out there, right now people don't care about that they just care that people don't care about that theyjust care that something bad happened for the russia. how would this go down with russia and affect combat troops? i russia and affect combat troos? ., , , russia and affect combat troos? ., ,, russia and affect combat troos? ., , , ~ troops? i honestly don't think that will have _ troops? i honestly don't think that will have much _ troops? i honestly don't think that will have much of - troops? i honestly don't think that will have much of an - that will have much of an effect, that has its own dynamics that are involved, it is a very serious thing. even something that can help a little bit the morale of the ukrainian defenders as a positive thing. that battle will be fought on the fundamentals of the opposing forces and i don't think it will have much effect on that. thank you very much for sharing your analysis with us.— your analysis with us. thanks for having — your analysis with us. thanks for having me. _ it's day 50 of the war in ukraine. russian gains remain limited as they continue to batter the strategically important city of mariupol in southeastern ukraine. it's been under siege for weeks, and now russia claims more than a thousand ukrainian troops have surrendered. but kyiv says the port city is still in its control. if mariupol fell into russian hands, it would create a land bridge between crimea, which russia illegally annexed in 2014, and areas held by russian—led separatists in the donbas region. more russian troops could be deployed to the east, for a new offensive already planned there. in the battle for mariupol, its mayor says around 21,000 civilians have been killed, and 120,000 remain trapped, in appalling conditions. 0ur correspondent, tom bateman reports now from the city of zaporizhia, where some people displaced from mariupol have ended up. a warning, his report contains upsetting images. this is a city reduced to darkness and death. russia's troops now occupy the theatre that was bombed as hundreds sheltered. their six—week siege of mariupol has brought it to the brink of falling. state tv in moscow showed these unverified pictures, claiming they are ukrainian soldiers surrendering. but the city's defenders posted their own videos, holed up in the port and a factory, still fighting, but their position seems desperate. "we won't give up," says this marine, "but we're encircled "with no resupply of ammunition or food." 100 miles north, just over the russian line, europe's 21st—century war is fought amid mud and rage in the trenches. mariupol�*s capture could see a push north, here. if mariupol falls, what will happen here? translation: well, we won't let this place turn into mariupol. - they're holding on. vitali shows me their soviet—era launchers. they also have brand—new western weapons but they want more, with the war about to move to a decisive phase. they're completely dug in here, as you can see. and the russians are that way. about 11—5 miles from here, within artillery range. and you can see they're ready for a long and grinding fight. they've been entrenched for 45 days. translation: we are on our own soil. - we expect them, to bury as many of them as possible. the more troops they send our way, the more fertile our land gets. russia's siege has killed thousands of civilians in mariupol and unleashed an appalling struggle for survival for the residents that remain. and these are the children of president putin's war. this hospital, north of the front line, is taking patients from mariupol and, like those in this ward, from elsewhere in the south and east. the doctors tell me they're treating children with injuries they usually see in soldiers, straight from the battlefield. for mariupol�*s survivors, whole lives are packed into a few bags. and they carry the fresh horrors of this war. lena and timothy are homeless. their apartment block obliterated in an air strike. ukraine's leaders call mariupol the "heart of their war effort" but they fear soon it could stop beating. tom bateman, bbc news, zaporizhzhia, in south—east ukraine. president biden has announced an additional $800 million in military assistance to ukraine. the package includes artillery systems, rounds and armoured personnel carriers. mr biden says evidence suggests russia is committing war crimes in ukraine. he says it's becoming "clearer and clearer," that vladimir putin wants to "wipe out the idea of even being ukrainian." over the past two weeks, russian forces have been withdrawing from the north around the capital, after failing to enter kyiv. their retreat from the areas, shown here in purple, has allowed a clearer picture to emerge of the terrible damage and destruction left in their wake. 0ur correspondent, mark lowen, has visited the towns of bucha and borodyanka, travelling with those trying to document evidence of war crimes committed by russian troops. his report contains upsetting details. ten more — the numbers, the mass graves, the contempt for life. some so badly charred, they're just the pieces for ukraine to pick up. the man and the inhuman. what happened here in bucha and elsewhere are notjust sins, says ukraine, but war crimes. french investigators and other international teams are helping prepare a lawsuit against russia. ukraine's prosecutor general says they've already opened more than 6,000 cases. a lot of people speak about genocide of ukrainian people, and actually, they have all grounds to speak about genocide. vladimir putin himself, he is president of aggressor. do you believe you will ever see him judged in an international war crimes court? it is very important, actually. it's very important to the whole world to stop dictators. the challenge for prosecutors will be to establish a line of command, from the grave to the top of the russian state, to show that crimes were not just committed, but ordered. perhaps that will help give ukrainians a sense of accountability, and that from such suffering can come justice. the long road to that goal, past a landscape of horror, is led notjust by the state, but by volunteer investigators, a grassroots army fighting for the truth. they come to borodyanka, gutted from the air in a relentless assault tearing out its heart. amidst the ruins, banned cluster bombs. the destroyed ground is fertile for the team building their case. we're trying to tell the world the truth, and we are trying not to let russia formulate their lying narratives about the war in ukraine. we are trying to show to people that those war crimes which russian troops are committing became, like, a pattern of their behaviour. among the shattered sea of victims are 0xana and her husband, nikola. they escaped — their apartment didn't. with the need to tell this story, comes the duty to collect it. translation: our home was our cosy nest. - we were planning our children's birthday here. my mother got outjust before the strike. it's hard to describe our terror. it's more like hate. it's very important to say what happened because these are notjust war crimes. russia will not stop until it destroys our country. freedom and safety, what ukrainians held dear, has been destroyed. their solace now would be punishment for those who have broken this country. mark lowen, bbc news, borodyanka. videos have emerged in the united states of a police officer fatally shooting a black man in the back of the head as he lay face—down on the ground. dude, i'm stopping you. do you have _ dude, i'm stopping you. do you have a — dude, i'm stopping you. do you have a license? do you have a license? — this is bodycam footage from the 11th of april. we are not going to show you the moment of the shooting. it happened following a traffic stop in grand rapids, michigan, and shows patrick lyoya, who was 26, running from a white police officer, the two men were then involved in a brief struggle over a taser deployed by the officer. two of the tapes show the officer kneeling on mr lyoya's back before shooting him. the authorities are investigating the incident. when i saw the video, it was painful to watch and i immediately asked what caused this to happen and what more could have been done to prevent this from occurring? i continue to ask those questions and will be looking for those answers as a result from the investigative process as well as future improvements to policy in practice. the incident has sparked protests in grand rapids. justice for patrick! justice for patrick! _ demonstrators gathered in the city centre and marched to the police department headquarters. there was a police presence but the march remained calm and peaceful. it wrapped up at around 9:30pm local time. thanks for your company here on bbc news. still to come: climate change or government neglect? what lies behind the high death toll of south africa's devastating floods. pol pot, one of the century's greatest mass murderers, is reported to have died of natural causes. he, and the khmer rouge movement he led, were responsible for the deaths of an estimated 1.7 million cambodians. there have been violent protests in indonesia, where playboy has gone on sale for the first time. traditionalist muslim leaders have expressed disgust. the magazine's offices have been attacked and its editorial staff have gone into hiding. it was clear that paula's only contest was with the clock, and as for her sporting legacy, paula radcliffe's competitors will be chasing her new world—best time for years to come. quite quietly, _ but quicker and quicker, she seemed just to slide away under the surface i and disappear. this is bbc world news. the latest headlines: the war at sea. a russian flagship forced to evacuate its crew after an explosion on board. more allegations that russia carried out war crimes in ukraine as investigators collect evidence in bucha. as russian troops withdraw from towns and cities in western ukraine, women are speaking out about the rape and torture they were subjected to by putin's soldiers. lauren wolfe is a journalist and professor who has reported on conflict rape all over the world for more than a decade. she says there are mechanisms in place to help victims of rape in ukraine. the really unique opportunity we have right now in ukraine is that it is — until this last month — it is a functioning system of, you know, internet, judiciaries, you know, doctors. there are institutions in place and that is really different from, say, rwanda during the genocide, syria just being bombed to bits. it is a very different situation, and getting the word out requires technology and it requires self reporting. so there are groups working with women, who are taking testimonies and they are coming out. does that help combat the crime? if there will be prosecutions — which i'm willing to bet there will be — but it is a very complicated subject. yes, you need to document every single rape or sexual assault in a very specific way, with as much information as you can, so the earlier the better when people's memories are fresh. because you cannot always see a physical sign of rape but you can sometimes corroborate with physical signs such as like cigarette burns, things like that. but more than that, it is what women and sometimes men remember hearing so if they — in syria, i can't remember what the phrase was but the men who were raping women kept saying, "you want your country, this is for your country" — something like that. so those kinds of patterns when they can be predicted can be prosecuted. we can figure out who is ordering them. and also some sort of paper trail. i mean, in bosnia, they left records everywhere, just like in ishmael, germany, during the war. a particularly nasty aspect of this is the strategic reasons used for rape in wars. when it comes to the ukraine conflict, how high up do you think this goes and do you think it is premeditated and large scale from what you have been hearing? you know, there are news reports saying that it is on a massive scale, which is also unusual to hear that very quickly. i would not be surprised if it was coming from above, which leads to difficulty in terms of going after the highest level — colonels, generals and then putin himself. but as a lawyer for the international criminal tribunal for rwanda told me a few years ago, you start where you can. you go as high as you can but you also go for the bottom people so you get everyone you can in some sort of courtroom. and one of the things about war crimes of this nature is a shame that carries through with the women in post—community life. are they getting a lot of help in ukraine after these atrocities? unlike a lot of conflicts, there are organisations in place already that help women. so we are getting reports from them — i've heard of one that is working with the ukrainian government to help women. so there is an infrastructure in place, unlike in most modern wars. the journalist and professor lauren wolfe there. to south africa now, where more than 300 people are now known to have died in severe flooding in the eastern province of kwazulu—natal. shingai nyoka reports. the aftermath of days of torrential rain, a month's worth of rain fell in a single day in some parts of kwazulu—natal. floods and mudslides destroyed key infrastructure. communities are in disbelief. some were lucky to escape with their lives, but the flood water took everything else. i've got nowhere to go now. i've got no house, i've got no nothing. these are my family's now, my neighbours. we try to give them a place to sleep last night. we never sleep last night. the situation is very, very bad. floods are fairly common here, but rescuers say that these are some of the worst they've ever witnessed. they have already retrieved the bodies of three people from a single family, and there is a desperate search for a fourth — a 10—year—old child. more than 300 people have died and it is expected that number will rise. rescue teams are overwhelmed and still trying to locate those who are missing. everything was a mess. we don't have food, clothes, even my id was damaged. we survived. but unfortunately, my child... ..did not survive. wailing today, south africa's president, cyril ramaphosa, toured to the affected areas to comfort the grieving and the displaced and to see for himself the areas destroyed, left without water or power. the president blamed climate change for the scale of the devastation. locals have said poor drainage is also to blame. the floods are subsiding and some communities recovering, but with more rain is forecast over the weekend, the province remains on high alert. shingai nyoka, bbc news. police in new york have arrested a suspect wanted in a shooting at a subway station in the district of brooklyn on tuesday after receiving a tip off to his whereabouts. ten people were injured when the gunman fired 33 rounds from a semi—automatic handgun. the bbc�*s tim allman reports. this was the moment that 62—year—old frankjames was taken into custody. picked up by officers in manhattan's east village after a tip off at a nearby mcdonald's. reporter: frank, are i you planning to respond? it was then taken to a police station and charged with several counts, including carrying out a terrorist attack on a mass transit system. the city's mayor announced the arrest via video link with a news conference. my fellow new yorkers, we got him. we got him. at 30—hour manhunt prompted by this attack on a packed subway station at the height of morning rush—hour. a gunman detonated smoke bombs and then opened fire on passengers. police quickly issued these photographs of someone described as a person of interest. that person of interest was frankjames. i want to commend all of the investigators and analysts who took part in this all—hands—on—deck investigation. literally hundreds of nypd detectives worked doggedly over the last 30 hours to bring this together. all of this, a terrifying incident for a city which has experienced its fair share of terrifying incidents. but this is, after all, the big apple. we are back to normal, nyc strong, right back to normal like nothing ever happened. it was really astonishing, it was like this is people's everyday commute, you aren't getting up in the morning thinking you aren't going to make it home or you will get hurt in the process of going. as for frankjames, he will appear in court on thursday. if he is found guilty, he could face life behind bars. tim allman, bbc news. the singing superstar barry manilow has been devastated to test positive for covid on the eve of the opening of his musical. he tweeted this. before we finish, i'd just like to bring you these pictures from ukraine, and a happy story. rescuers digging with their bare hands managed to pull out a puppy alive from the rubble of a building, as you can see in this video released by the donetsk regional police. the rescuers heard the puppy whining as they were picking through the rubble. the puppy doesn't seem to be too seriously injured. he was reunited with his grateful owner who praised the rescuers for acting so quickly to find his best friend. thanks so much for watching. goodbye. hello there. apart from the odd shower, it does look like many places will stay dry for the run—up to easter and for many of us it will stay quite warm as well, particularly for england and wales where we will see the best of any sunshine throughout the day on thursday. we have a weak area of high pressure tending to build in across the country. that should keep these weather fronts out at bay, which will tend to threaten parts of northern ireland and scotland through the day. however, they will tend to bring thicker cloud here through the day. some spots of rain around, particularly for western scotland. elsewhere, any low cloud, mist and murk will tend to clear away, certainly inland. that allows for some good sunny spells to develop, although it could stay quite murky around the coast. and it is just an outside chance of a shower across eastern england. you'll get another warm day to come from many. 15—19 degrees, we could see 20 degrees again somewhere in the south—east. we saw a repeat performances as we head through thursday night. showers die away and we start to see more low cloud, mist and murk rolling in to southern and western areas, in particular. i think eastern areas will see lengthier clear spells. and, again, it is going to be another mild night. so, for good friday we start off mainly dry. sunshine from the word go across eastern areas. a bit more in the way of cloud across the north and the west. perhaps an odd shower for northern ireland, wales, the south—west of england, otherwise most places dry. and it could be the warmest day of the week, good friday. we could see 21 degrees some places in the south—east, but even further north, the mid to high teens. as we head through the easter weekend, it does look like our area of high pressure could start to break down, and that may allow low pressure and weather fronts to sweep in to the north and the west through easter sunday and easter monday. so some areas in the north could be fairly wet. saturday itself doesn't look too bad. much of england and wales, again, dry with some good spells of sunshine. a bit more in the way of cloud across scotland, northern ireland, perhaps some some irish sea coast, the odd shower here. and temperatures, again, mid to high teens for many, probably highs of 18 or 19 in at the south—east. temperatures just coming down a little bit. easter sunday at this stage could be fairly wet across parts of the north and the west for a while. more active weather fronts try to work their way eastwards. again, midlands, eastern england, southern england could stay dry. some good sunny spells and temperatures in the mid—to—high teens once again. so i think we're starting the easter weekend on a largely fine and pretty warm note, with some sunshine around, the best of it to the east. but there is an increasing chance of unsettled weather trying to push in from the north and the west for part two of easter weekend. this is bbc news. the headlines: russian state media is reporting that the most important ship in russia's black sea fleet, the moskva, has been badly damaged after ammunition on board blew up causing a fire. quoting the russian defence ministry, interfax says the crew had all been evacuated and an investigation is under way. ukraine's defence minister says ukrainian fighters are continuing to defend mariupol. russia says it has now fully taken mariupol�*s sea trade port, but this has not been confirmed. russia says more than 1,000 ukrainian marines have surrendered. meanwhile, the united states says it's sending more weapons to ukraine's military. president biden says the evidence appears