welcome to bbc news, broadcasting to viewers in north america and around the globe. my name's mike embley. our top stories. a warning from pyongyang. north korea tells the bbc it's ready for war if america launches an attack. translation: if the us is reckless enough to use military means it would mean, from that very day, an all—out war. donald trump telephones turkey's president erdogan to congratulate him on his victory in sunday's referendum, despite criticism of the poll from international observers. facebook orders a review after video of a man being shot dead was posted on—line. police are still hunting the killer. and as the french presidential election enters its final stages, we take a closer look at the far—left candidate who may yet cause a surprise. in a rare interview, a senior north korean official has

told the bbc his country is prepared to launch a nuclear strike, "all—out war," if the united states decides to attack it. he also said missile tests would continue, "weekly, monthly, yearly," despite international condemnation. president trump has suggested the leadership in pyongyang needs to "behave", and vice—president pence warned pyongyang not to test the us. the north korean vice foreign minister was speaking to our correspondent, john sudworth, in the north korean capital. john is being closely monitored there. north korea is all about shows of strength. the first today came in this tae kwon do demonstration. the next, in kim il—sung square, close to the centre of power, by way of a rare interview. translation: if the us is reckless

enough to use military means, it would mean, from that very day, an all—out war. our nuclear weapons protect us from that threat. we will be conducting more missile threats on a weekly, monthly and yearly basis. today, the us vice president, mike pence, was in south korea, visiting the demilitarised zone that separates the two halves of this divided peninsula. he, too, was talking tough. it was a period of strategic patience but the era of strategic patience is over. president trump has made it clear that the patience of the united states and our allies in this region has run out. but, despite the posturing on both sides, the risks are limited. for the us and its allies, war would be far too costly. and north korea's threats, although deeply alarming, are always conditional. if you could send one message to donald trump today, what would it be?

on our sovereignty, then it will provoke an immediate counter reaction. if the us is planning a military attack against us, we will react with a nuclear pre—emptive strike by our own style and methods. tonight, although all options apparently remain on the table, the us appears to be signalling that diplomacy and toughened sanctions are now the most likely way forward. it's yet unclear how, having failed before, they will persuade this most totalitarian of states to disarm. there is strong evidence that beyond the gloom of this city lie vast political prisons, gulags in which all dissent, however mild, is crushed. although, in his interview, the vice minister called that accusation a lie. militarised, isolated and repressive, north korea has the right to follow its own path and, he insisted, no—one will be

able to stop it. john sudworth, bbc news, pyongyang. the country with most to fear from the rising tensions is of course south korea. our correspondent, stephen evans, is in the capital seoul. have a look around. it is a completely normal city and doesn't feel like a city that fears war. food markets everywhere, people going about their business. that's because for pretty well 60 years now they've lived with threats from the north. bloodcurdling threats and they never come to out and out war. that's how it feels now. the american vice president has been here and has used all of those words, "shoulder to shoulder", "alliance", "100% support", but what he hasn't made clear is how he is going

to persuade orforce kimjong—un to dismiss his nuclear path. he says if north korea attacks this place, only 50 miles from north korea, there would be an overwhelming response. but they've always assumed that here, but it would have been what president obama had done. that central question of how you make kim jong—un change his policy remains unanswered. you saw injohn‘s report that the us vice president mike pence is in the region. he'll arrive in japan shortly, another us ally which is unnerved by the rising tensions. our correspondent, rupert wingfield—hayes, is in tokyo.

i know this visit by mike pence was planned long before this crisis. how important is japan planned long before this crisis. how important isjapan in all of planned long before this crisis. how important is japan in all of this? is very important. it is home to the majority of us forces in the region. there is a big naval base south of tokyo. mike pence will visit that tomorrow. many other us bases as well. also, japan is now a target. steve evans was talking from seoul, which has long been a target of north korean artillery shells, because it is so close to the dmz. -- dmz. because it is so close to the dmz. —— dmz. japan is now well within reach of the list it missiles. it now feels very much on the frontline. i think the government in japan actually welcomes the harder line being taken by the trump administration because the feeling here from the government of prime minister shinzo abe is that the

obama administration was really far too soft on north korea for far too long and now they want to continue to stop them looking for nuclear weapons. how do you think this crisis might be defused? what is mike pence mean when he says the era of strategic patience is over? he is talking specifically about president obama's policy which was called strategic patience. the feel inhere in the region is that what the donald trump administration is doing by threatening them is putting pressure on china. —— in here. everyone still believes that china is the key to tightening sanctions against north korea. if that is the route to getting control of north korea or getting it to back down, the feeling is china has to come on board. the realistic threat of

military action against north korea is something that will scare china. china may have taken action already by threatening to cut off oil supplies to north korea following the trump administration's change in policy. maybe this tougher policy is having some effect in beijing. thank you very much for that, rupert wingfield—hayes. we'll have continuing coverage on north korea here on bbc world news. until then, do go to our website for more background including the capabilities of north korea's missile programme. that's all at bbc.com/news or download the bbc news app. donald trump has congratulated turkey's president, recep tayyip erdogan, on winning a referendum which will give him sweeping powers. earlier, international observers criticised the poll, calling it unequal. but at a rally in ankara mr erdogan said the vote ended all debate. translation: know your limits.

turkey will neither listen to, look at, or acknowledge this political report we will continue in our own way and we will continue to walk our path. this country has had the most democratic election, the likes of which has never happened in any western country. a short time ago, i asked jamesjeffrey, a former us ambassador to turkey and iraq, if the referendum result is a step forward for the country. that depends on what kind of turkey you want. half of the population wanted a strong man rule. this is institutionalising the kind of thing he has been doing for some time and legalising it.

the other half wanted to see turkey on a different road. the result was a slim margin. we have to see if there was any voter fraud. they voted for him. it's kind of like brexit. do you see this as a done deal? an absolute victory for president erdogan despite the criticism of observers and hopes for court challenges? well, we'll have to see. what the oecd said, who looked at this, they said they were vote in regularities and stamps that a judge said did not have to be on the ballot at the last moment. it wasn't a fair playing field because president erdogan dominated media. that's different to saying that the vote was wrong or there was fraud. that would be a significant change. at the moment, we believe he won fairly. turkey is an important country, strategically important in the region. it is a nato member and is sheltering millions of refugees who might

otherwise be in europe. how do you think europe and the west should deal with the situation? president trump made the right decision. this is not 15 years ago in the post—end of history where everyone is tried to become good, liberal democracies. we have, as you havejust heard, the north korean nuclear threat and iran running amok. in the last week there was sarin gas in syria. there is russia and china. we need someone who we can work with who supports the global status quo. turkey, for all of its faults, it does. thank you. more of the main news for you briefly. a major manhunt is under way in the united states, after a man shot dead a grandfather, apparently at random, then posted footage of the killing on social media. facebook has said it is reviewing the way it deals with violent videos like this one, which remained on the site for over two hours

before being taken down. yes, it is. a huge manhunt. notjust in ohio where this happened, the city of cleveland, but right across the united states. the police are saying, they have no idea where this man is. they have had a few reports of possible sightings, but nothing especially substantial. so, it is a huge manhunt. many, many resources, people, they are working on this across the country. and the police are describing this man as, of course, potentially dangerous and armed. on facebook live. first of all, these story seems to be the murder was committed on facebook live. viewed live. now it seems that is not the case.

no less horrifying. now it seems he has claimed more victims. it was not on facebook live, as you said. facebook released a timeline in terms of when the various videos were uploaded. there were three videos. the third was facebook live. that was essentially the confession after the murder. there were two earlier videos. one a minute or so before the actual murder in which he said he intended to commit murder. then there was the killing itself, which he shot on his phone and then uploaded to facebook to be and then just a few minutes after that, and people have seen this it is a video shot in his car. this was live. he was in a conversation rambling to an unknown person. he talked about how he just snapped and described himself as a monster. it seems he blames everyone but himself whatjust happened. the family of the one known victim

have been responding. yes. they are understandably distraught as to what happened. they say they have seen the video, which of course makes it all the more terrible for them to have had the experience that. they have had the experience that. they have seen what the grandfather, 7a yea rs have seen what the grandfather, 7a years old, had to go through. the family is grieving. people are looking into the situation and saying how could this have happened? he seems to have had quite a good reputation. the people who have known him have been talking as well and saying they just known him have been talking as well and saying theyjust cannot understand what went on in his mind and what caused him to do this. stay with us on bbc news. still to come: flip the sixth! a political fightback in the deep south. why the democrats are hoping georgia could become ground zero in the battle against donald trump. the stars and stripes at half—mast

outside columbine high. the school sealed off, the bodies of the dead still inside. i never thought they would actually go through with it. some places have already had nearly as much rain as they would normally expect in an entire year. for millions of americans, the death of richard nixon in a new york hospital has meant conflicting emotions. a national day of mourning next wednesday sitting somehow uneasily with the abiding memories of the shame of watergate. and lift—off of the space shuttle discovery with the hubble space telescope, our window on the universe. this is bbc news. i'm mike embley.

our main headline: a member of north korea's government has told the bbc his country would react with a pre—emptive nuclear strike if it saw signs that the us was preparing an attack. it's less than a week until the first round of the french presidential election, and polls suggest it's now a four—person race. on monday evening, the far right candidate marine le pen laid out her tough line on immigration. translation: for france, i would decide on a moratorium on all legal immigration to stop this frenzy, this uncontrolled situation that is dragging us down. a moratorium to take stock of the situation before putting new, much more drastic, more reasonable, more humane, more manageable rules and regulations in place. as i mentioned, there are four

candidates in the running, with the centrist candidate emmanuel macron and marine le pen pretty much neck and neck in the polls. the centre right candidate francois fillon is not far behind, nor is the far—left candidate jean—luc melenchon. our correspondent lucy williamson has more now on his surprising run. jean—luc melenchon has been enjoying a different kind of political party. the kind which comes with a big group of people and a sense of celebration. once seen as the protest vote, the communist backed candidate has surged to within a couple of points of the presidential favourite, with his lively way of speaking and his anti—elitist slogan, ‘chuck ‘em out.‘ translation: this campaign has become more than a campaign, it's huge populist mobilisation which rings in a new dawn. mr melenchon wants to pull france out of eu treaties, ramp up public spending

and introduce a top rate tax of 90%. frederick hasn't voted for anyone in more than a decade. translation: i'm a worker and most workers today vote for the right or the far right, it's not in their interests. camille says she's 80% sure of voting for him and that her friends are leaning towards him too. all my friends are going to vote melenchon, all of them. i think there's really a big change among people my age and the youth in general. the trump election made me realise that i need to take a position. his rivals are starting to worry. campaigners for the liberal favourite, emmanuel macron, are now targeting underprivileged areas where his far—left rival is expected to do well, with specially written leaflets and instructions to target melenchon supporters, along with undecided voters. nobody knows what will happen,

that is why we are here today, because we have to convince more and more people to vote for him. this is now becoming a four—way race with three of the candidates seen as political outsiders and a third of voters still undecided. analysts say france is in uncharted territory and the election is impossible to predict. mr melenchon first drew attention to his campaign by appearing at his rallies via hologram. he's planning to appear simultaneously at six locations tomorrow. if this election has shown anything, it is that the constraints of one candidate or another, can turn out to be just a trick of the light. lucy williamson, bbc news, paris. now to the us and the well—heeled suburbs of atlanta may seem an unlikely place to start a political fightback against the republicans,

but that's exactly what democrats hope to do on tuesday. rajini vaidya nathan reports from georgia's sixth district. we need some more democrats in washington, trump is a disaster. who do you think should win the seat? a republican candidate. for the very first time i'm voting democrat. the sixth congressional district in georgia's been in republican hands for decades, but democrats think this man can win it back. let's win this on april 18th... jon ossoff is a political adviser turned documentary maker and he has raised more than $8 million in a race that has been dubbed the ‘make trump furious' campaign. more than anything i think it would be a win for the thousands of grassroots volunteers who are getting involved in this community, many of whom have never been involved in politics before who see this is a moment where we need to stand up and make a statement about the kind of politics we want. there's no limit to the number

of candidates standing for the party and so there are a whopping 18 contenders, ii are republicans, which could split that party's vote. unlike on the democrat side where a coronation, republicans believe in competition. that competition has seen a number of antiestablishment candidates enter the fray, including businessman bruce levell, who's close to donald trump. this whole game's been changed across the country and you'll see over the next two years you will see in mayoral races, city council races, state house races, congressional races, because people are tired — republicans and democrats have done a horrible job of getting involved with special interests and lobbyists and pay to play, that's the tension now in dc. this crowded field of candidates includes local politicians, business people who have never held office and democrats trying to fight back.

in many ways this race reflects politics across america and that's why it is being watched so closely. in november, donald trump won this district by a tiny margin after many republican voters deserted the party. the result here could hinge on how they vote this time. traditionally i have been voting republican. i've not really been happy with the trump administration and i want this as a message against the trump administration. i think more democrats are excited than the republicans this time around because of what we saw the last election. i'm backing a republican candidate that i think will do a good job. i don't really care for republicans these days, not a fan definitely of donald trump's, i'm probably going to vote for the democrat. i don't really care for republicans these days, not a fan definitely of donald trump's, i'm probably going to vote for the democrat. whatever happens here will send a message across america. could this be the start of the democratic comeback or will it cement the republican party under donald trump? rajini vaidyanathan, bbc news, in georgia's sixth district. there are a number of independent

cinema festivals with san sebastian and sundance some of the best known on the circuit. but now an unlikely place is vying to join the list of must—visit international film festivals, a small cuban fishing village called gibara. will grant reports. asa as a sitting for a film festival, gibara has nothing to bejealous of either cannes or sun dance. nestled on the coast the sleepy fishing village goes largely unnoticed for much of the year but for one week the great and good of cuban cinema dissent in their droves. founded in 2003, the festival of low—budget cinema was the brainchild of renowned cu ban director solus cinema was the brainchild of renowned cuban director solus who had the idea while shooting a film in the town. the late director's family, who received an award on his behalf, said although it's now called the international film

festival of gibara, its essence remains the same. translation: the change in name might open it up but the underlying reference maintains the underlying reference maintains the same, gibara is a space for alternative, independent cinema. although it's now known as an independent festival, it remains identified with indie filmmakers. still, the profile of the event is undoubtedly growing. this walk through the town is the traditional way of opening the festival in gibara and every year it seems a little more popular, this time bringing with it the occasional hollywood star. among those participating in this year's festival is the academy awards winning actor benicia odell toro, who has a long—standing affection for the island. as long as you don't forget where you come from. john lennon said something along those lines, the problem isn't making money, the problem is that it should facilitate and give you more time to write more and to do more what you love to do. i think that if it gets

bigger it shouldn't change the people or change the festival, it should not change the spirit of the festival. the people of gibara clearly enjoy the annual celebration of cinema and the income it generates for the town. however, there is a question of how much larger it can grow one of the festival's guests, cuba's tourism minister, says they're hoping to expand on the town's existing infrastructure. despite its modest size, this is now a highlight of the cubans calendar and as gibara moves from low—budget to international film festival, its rise is perhaps a metaphorfor the changes happening across cuba. will grant, bbc news, gibara, cuba. more on that and all the news on the bbc website and you can reach me and all the team on twitter. thanks for watching. hello there.

the weather may provide something of a shock to the system early this tuesday morning because temperatures have been dropping away. a cold and frosty start to the day, but after that chilly start, there are plenty of sunny spells on the way. high pressure firmly in charge of our weather at the moment, giving us largely dry conditions, and behind this weather front, the cloud has been clearing. and underneath those clear skies, temperatures have been dropping. many areas, particularly out in the countryside, starting the day below freezing. but, as i mentioned, after that chilly start, we will see plenty of spells of sunshine. a little bit breezy down towards the south—east, so that will make it feel particularly chilly, and as we go on through the day, cloud will gradually increase from the west, so the sunshine will turn increasingly hazy. in fact, by the end of the afternoon, i think the skies will be largely grey across northern ireland and the western side of scotland, maybe even the odd splash of rain into the western isles. but for shetland, for orkney, for eastern and southern scotland, we should hold onto some hazy

sunshine, just seven degrees in aberdeen, eight or nine in edinburgh and glasgow. and with some high cloud spreading across northern england down into wales, again the sunshine here will turn a little bit hazy through the afternoon. 11 degrees there in aberystwyth. fairly light winds across wales. light winds too across the south—west. maybe 13 with a bit of shelter there in plymouth. some patchy cloud across the midlands. east anglia and the south—east should keep plenty of sunshine but pretty cool, particularly around the coast of east anglia. now, as we go on through the night into wednesday morning, england and wales where we keep clear skies will turn very cold again, a widespread frost. not as cold for northern ireland and scotland because here we'll have more cloud and some outbreaks of patchy rain courtesy of this very weak weather front just sinking its way into the picture. but behind that front we start to bring in more of a westerly wind, so won't be as chilly across scotland and northern ireland on wednesday. some extra cloud also sinking into northern england, but through the midlands, south wales, down into southern england, here the best of the sunshine, 14 degrees the top temperature there in london.

temperatures in the south particularly could rise further on thursday and friday. there'll be some further spells of sunshine. generally a fair amount of cloud around by this stage. so, to sum up this week, we'll see very little rain, it will be mostly dry. the days will be turning warmer, although some of the nights will continue to be frosty. but then by the end of the week and into the weekend, well, it looks like cold air will return from the north, so those temperatures will drop. quite a chilly feel, i suspect, by the coming weekend. the latest headlines from bbc news: in a rare interview, a senior member of north korea's government has told the bbc his country is prepared to launch a nuclear strike, "all—out war," if the united states decides to attack it. the vice foreign minister also said missile tests would continue, "weekly, monthly, yearly," despite international condemnation. donald trump has telephoned turkey's president, recep tayyip erdogan, to congratulate him on his victory in sunday's referendum, which will give him sweeping new powers. international observers have

criticised the fairness of the poll, and opponents hope to challenge the result in court. mr erdogan is extending the state of emergency in turkey for another three months. facebook is reviewing the way it handles violent videos and other material violating its standards after video of an apparent random killing stayed on the site for more than two hours. the company says it'll make the review process faster. the alleged gunman is still on the run. this summer, some gcse grades in england are changing, with a* to g being replaced by grades nine to one, a move that's creating "huge uncertainty," according