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. 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. the moscow gained notoriety early in the war when ukrainian border guards defending an island refused its demand for their surrender. steve fish is a political science professor at the university of california, berkeley and he's there for us now. thank you forjoining us, there are military and psychological impact of this news, can we start with the military first? what is the significance of a ship like this being wholly or even partly put out of action in such an important strategic decision for the russians? it is such a big development, actually. in strictly military terms, this was the ship that kept safe the other ships that were launching missiles at ukrainian territory and whose involvement in this new invasion of the south and the east were absolutely crucial. by east were absolutely crucial. by removing the ship, the whole russian effort to take southern and eastern ukraine is very much lessened. this actually have an enormous, immediate military impact. beyond that, though, the effect on morale as you can imagine is huge as well. for russia to actually lose its flagship carrier, and for the ukrainians to know that they have actually taken this out or at least the russians took it out is a huge morale boosterfor took it out is a huge morale booster for the ukrainians and a big demoralising for the russians.— a big demoralising for the russians. ._ russians. indeed, we may never know the truth _ russians. indeed, we may never know the truth about _ russians. indeed, we may never know the truth about what - russians. indeed, we may never know the truth about what the l know the truth about what the cause was but it doesn't really matter, does it because in the fog of war, can claim victory, they can claim it was a missile strike. do you think it could affect morale as far away as the east of the country for ukrainians?— the east of the country for ukrainians? absolutely, it is auoin to ukrainians? absolutely, it is going to affect _ ukrainians? absolutely, it is going to affect morale - ukrainians? absolutely, it is going to affect morale in - going to affect morale in general, and as you suggest, if the ukrainians took it out, for the ukrainians took it out, for the ukrainians took it out, for the ukrainian people to take out the flagship of the whole black sea as an enormous score but if it was just russian incompetence, it was just an explosion going on on their most important ship, that is really a demoralising for the russians as well. but really a demoralising for the russians as well.— russians as well. but for russians. _ russians as well. but for russians, they _ russians as well. but for russians, they will - russians as well. but for russians, they will be i russians as well. but for l russians, they will be able russians as well. but for - russians, they will be able to control the information to their troops preparing in the east for this assault. what kind of news do you think would filter through from something like this? how could they control the news and how damaging could it be? it is auoin to damaging could it be? it is going to be _ damaging could it be? it is going to be very _ damaging could it be? it 3 going to be very damaging. they won't be able to control the news on the battlefield among russian troops, this is the kind of thing that gets out and evenif kind of thing that gets out and even if the troops on the ground themselves don't hear about it, in ukraine, the russian troops, the elites in the war planners know about it. the russian naval officials obviously know about it and it is then that we need to worry about demoralising. they are already demoralised, this will only deepen demoralisation amongst russian elites and for planners. amongst russian elites and for lanners. ,, , ., planners. steve fish from the university _ planners. steve fish from the university of _ planners. steve fish from the university of california, - planners. steve fish from the university of california, thank you forjoining us. 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 1,000 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 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 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. the news came shortly after mr biden spoke to ukraine's president volodymyr zelensky. meanwhile, president biden says the evidence appears to suggest, that russia is committing genocide 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 borodianka, 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. stay with us on bbc news, still to come: climate change or government neglect — we get an environmentalists perspective on what lies behind the high deathtoll 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, 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. lauren wolfe there. 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. 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 incident has led to protests. state police 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 continued to ask those questions and will be looking from those —— for those answers is a result of the investigations as well as future improvement as. police in new york have arrested a suspect wanted in a shooting at a subway station in the district of brooklyn, on tuesday, after receving a tip off to his whereabouts. 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 tipoff 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. 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 that 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. president ramaphosa has blamed climate change for the intense rainfall and said south africa could no longer postpone dealing with global warming. i asked dr mao amis, executive director of the african centre for a green economy, if south africa is most worried about heavy rainfall as the climate changes. yes, the conditions for south africa show there will be extreme rainfall and, in some cases, flooding. and also drought in some cases. so it is extreme events that will happen and unfortunately i would say that the level of preparedness is not up to scratch and so evenin is not up to scratch and so even in places like durban, we know these floods happen, but most of the time people are caught unprepared. find most of the time people are caught unprepared. and poor infrastructure _ caught unprepared. and poor infrastructure does _ caught unprepared. and poor infrastructure does not - caught unprepared. and poor infrastructure does not help. | infrastructure does not help. we are hearing about damage property, crocodiles on the list, cellphone towers down, this is a test for local authorities as well? absolutely. most south african dissenters do have some kind of climate change programmes but they are not translated into specific strategies that could be implemented with a budget and so on so what happens is that of maintaining infrastructure like stormwater systems and so on, are not maintained so when an incident is like this happens, this is what we see. dr mao amis ending our bulletin event. from the team and from me, goodbye. thank you for your company. hello there. apart from the odd shower, it does look like many places will stay dry for the run—up to the 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. some 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, other most places are dry. and it could be the warmest day of the week, 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. and disappear. 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 underway. president biden says the evidence appears to suggest, that russia is committing genocide in ukraine. the chief prosecutor of the international criminal court has described the country as a crime scene. karim khan was speaking in bucha, a town outside kyiv where hundreds of civilians were killed. ukraine's defence minister says ukrainian fighters are continuing to defend mariupol.