an parts of the country. an unsettled week ahead. nothing settled about the weather. this is bbc news. i'm lukwesa burak. the headlines at 3pm: a fresh warning for north korea from the us president — donald trump says it will "regret it a fast" if it continues to threaten america or its allies. they will be very safe. if anything happens to guam, there's going to be big, big trouble in north korea. scotland yard have arrested a man, after a woman and her daughter were fatally stabbed in north—west london. police, investigating the death of 83—year—old peter wrighton, who was stabbed while walking his dog, have arrested a man in his 20s. at least two people shot dead in kenya during overnight protests against the re—election of the country's president, uhuru kenyatta. and london prepares to say goodbye to two legends at the world athletics championships, as mo farah and usain bolt prepare to take to the track for the final time this evening. and coming up — a look back at the history of the supermarket

self—service check—out machine, which is a lot older than you might think. find out in click at 3.30pm. good afternoon and welcome to bbc news. the chinese president, xijinping, has urged the united states and north korea to show restraint, amid the growing crisis over north korea's nuclear programme. during a telephone conversation with president trump, china's leader urged both parties to avoid words and actions that could increase tensions. earlier today, mr trump called the governor of guam to show his support for the us pacific territory, which north korea has threatened to fire missiles at. from seoul, robin brant sent this report.

first, he threatened fire and fury in north korea, then last night president trump said us forces are locked and loaded. now there's more short—phrase diplomacy as the tension goes even higher. anything happens to guam, there's going to be big, big trouble in north korea. in just a matter of days, the country on the brink of becoming the world's newest nuclear power has threatened to land missiles just a few dozen miles from the us territory in the pacific. good morning, mr president. good morning, good morning, it's great to speak to you... in a call with the island's governor, mr trump had this to say about the regime in pyongyang. this is between you and i, but you don't talk like they talk, you can't do that, you can't do that with people like us. yeah. guam is home to us military bases, a fleet of bombers, and tens of thousands of people — americans who are now being told what to do in the event of a nuclear explosion.

meanwhile, diplomacy is going on. in another presidential call, donald trump spoke to xi jinping, china's president. he's key to any future peace deal. they agreed north korea needs to stop its provocative actions. but mr trump was also told that all relevant parties, him included, should stop exasperating the situation. in the south korean capital, they've lived with the threat from their northern neighbours for decades. there are reports today shoppers are buying more ready meals and investors buying more gold — signs that people may be stepping up their preparedness. in just over a week's time, they'll have a civil—defence drill in this city. the sirens will go off, people will be guided from above ground to metro stations or bomb shelters to take cover from any possible aerial attack. it happens every year. last year, just a handful of districts in seoul took part. apparently, this year, everyone‘s taking part. across the sea injapan, another possible target, the military is also preparing missiles, but these are for defence.

these transporters have been moved to places where they could intercept any north korean missiles flying over. robin brant, bbc news, seoul in south korea. earlier our correspondent spoke to us from seoul about the reaction there to president trump's latest comments. i think there are people here who are clearly very unsettled by what they're hearing out of washington, or rather newjersey in this instance. they're not used to hearing a us president talk like that. to what his predecessors have, which is they don't want a nuclear north korea. we're seeing renewed pressure on china from the us president. there's hints on monday he may announce an investigation into the trade relationship between his country and china, because he believes that's not fair. but also he believes china isn't doing enough to try and rein in north korea and get them to end their nuclear ambitions. a man has been arrested on suspicion

of double murder, after a mother and daughter were found stabbed to death in their home. the women aged 66 and 33 were pronounced dead at a property in north london last night. a 27—year—old man is in police custody. let's cross to our correspondent simonjones who's in golders green in north london. bring us up to date with the latest development. some dramatic scenes here this afternoon. we saw the police helicopter in the sky. then we saw a number of police vehicles with flashing lights, head down a neighbouring road. the met police say they arrested their suspect around 2pm. they say he was spotted bya around 2pm. they say he was spotted by a member of the public in a nearby park. we saw the moment of the arrest where he was put into a police van and at that point, there we re police van and at that point, there were armed officers also involved. they had named earlier their suspect

as 27—year—old joshua cohen. that was what the police appeal had been about at that time. the man who was arrested was 27 years old. we know the police were first called to the scene yesterday evening just before 9pm to reports that two women had been seriously injured. when they went to their home they found the women, 33 and # 6. they were —— and 66. they were stabbed and pronounced dead at the scene. the police describe today as an horrific attack. they understand it will be shocking to members of the public and have stepped up patrols in the area. they have told us they believe that the suspect in this case and the two people who died were known to each other. simon jones, thank you. detectives, investigating the death of an 83—year—old dog walker stabbed to death in woodlands in norfolk, have made an arrest.

the body of peter wrighton was found three miles south of east harling in norfolk. he had been repeatedly stabbed in his neck and head, post—mortem examination tests showed. norfolk police has arrested a local man, in his 20s, on suspicion of murder, and he remains in custody while inquiries continue. an anti—islam campaigner has been approved as a candidate in the election for a new ukip leader. anne marie waters is the founder of the campaign group sharia watch which has previously called islam "evil". her candidacy has divided the party. some prominent figures in the party say if she wins, they'll quit. a new leader will be announced in september. i'm joined by our political correspondent ben wright. how much ofa correspondent ben wright. how much of a problem is anne marie waters proving to be for ukip? turmoil continues within ukip. it's been a wretched few months for them.

dreadful result in the general election. failed to win a single seat. paul nuttal, their leader then, quit. ukip is starting the process of choosing their fourth leader in a year. it has been to understate it — a very turbulent time for ukip. last night, the pa rty‘s time for ukip. last night, the party's executive time for ukip. last night, the pa rty‘s executive committee time for ukip. last night, the party's executive committee did decide that one of the ii party's executive committee did decide that one of the 11 names that would go onto the ballot would be anne marie waters. she's clearly controversial. many people would feel she has abhorrent views of islam, which she's described as evil in the past. she set up a pressure group called sharia watch, monitoring, trying to curb sharia courts. i think many within ukip are very concerned about this. mike hookham has resigned the party's whip. another nathan gilks, an mep, said he would leave the parties. he said he would leave the parties. he said he would leave the parties. he said he understands why she's on the

ballot. that seems to be the prevalent view today in ukip. uncomfortable that she has made it onto the final list. but they feel that perhaps during the course of this leadership election her views can be challenged, can be taken on, ta ke can be challenged, can be taken on, take an part by other candidates and i think as far as the majority of people in ukip are concerned, they hope that she won't get the position. clearly, we're entering into another difficult few weeks for ukip as they go through the process of electing a leader. thank you. new measures to tackle the dangerous use of laser pens will be considered by the government, after concerns about their threat to air safety. the lasers, which can temporarily blind people, have been used to target aircraft and pilots, as our business correspondent, jonty bloom, reports. laser pens or pointers are designed to be used to highlight something of interest, but they can be dangerous — and dazzle or blind people if shone directly at their eyes. last year alone, there were 1,258 laser attacks on aircraft, even though it's already an offence with a maximum fine of £2,500. helicopters, which fly lower

than many aircraft and typically have only one pilot, are thought to be especially vulnerable to laser pens. the government is now going to consult on new measures to restrict the dangerous use of laser pens and boost safety, such as introducing a licensing scheme for retailers, limits on the advertising of laser pens, and potential restrictions on their ownership, as well as a possible awareness—raising campaign to educate people about the dangers of laser pens. interested parties, including businesses, retailers and consumers, now have eight weeks to submit their evidence and proposals. jonty bloom, bbc news. tensions remain high in kenya after the incumbent, uhuru kenyatta, was declared the winner of the disputed presidential election. there has been violence in areas that support the opposition candidate raila 0ding, at least nine people have

—— at least two people were killed in overnight protests tomi 0ladipo reports from nairobi. i wish to declare honourable uhuru kenyatta president—elect and honourable william ruto as the deputy president elect. applause. after a bitterly fought campaign, it's official — president kenyatta will be in office for another five years. mr kenyatta won more than half of votes cast. the news brought out his supporters in their numbers, following a long wait for results. the party is over, it's the day after and for kenya now comes the hard part. those celebrating mr kenyatta's win last night did so in the hope of a better quality of life. now the president has to deliver for them and he also has to gain the trust of the millions across the country who did not vote for him. and mr kenyatta has been reaching out to the other side. we cannot fight over an election. we have seen the results

of political violence and i am certain that there is no single kenyan who would wish for us to go back to those days. but angry protests broke out overnight in some opposition strongholds. the main opposition party has rejected the election results and says it does not trust the courts to handle its concerns fairly. its next move will be crucial in determining whether kenya moves on peacefully. earlier i spoke to tomi who's in nairobi, and i asked him what the situation on the streets was like. well, the running battles are still going on in some of the slums of nairobi as well as in another city, which has a strong base of support for raila 0ding. we are hearing conflicting reports from there. it's clear that the police

are still clashing and they're still firing tear gas to disperse the protesters. how key is kenya in regional stability? the world is watching very closely. we expected, there was an expectation of violence as well. kenya is the major hub in this part of africa. it's the regional hub. it's a beacon of stability really and a lot of the rest of eastern and southern africa, eastern and central africa rather, depends on kenya as a route into parts of africa which are inland. so this stability would affect what happens in other countries, so everybody will be looking at kenya, because it has been this economic hub and a democratic beacon as well. so whatever happens in kenya, others countries are looking at. yes kenya has had a past where there was post—election violence. it has grown since then.

so whatever happens from now would also be able to show the rest of the region as well as other foreign investors, who put a lot of their money in this country that the stability that kenya can show would have long lasting implications, positive implications. these clan divisions between the two families go back to 1963, yet they're still prevalent today. mr kenyatta said he is willing to work together. what would that possibly look like — another unity government? that's not clear. i don't think that would probably happen right now. 0ding has been in politics for a while. he's a veteran. he's 72. this is the fourth time he has run for president. i guess he would feel that he deserves a chance to be president and if he doesn't win now, then probably this is his last chance but i don't see the incumbent president kenyatta

giving him some room in his government. he would feel that he has campaigned well. he's done what he needed to do and that the electoral process was fair. so his message yesterday, his acceptance message after being declared the winner, he called on the opposition to accept that they had lost and they could work together, forge a way forward for national harmony, for peace. i think that's what they'll be trying to see right now. a lot of kenyans also would be looking to the opposition leader and saying, you know what, kenya's bigger than you and you just have to accept and move on. the headlines on bbc news: president trump has warned north korea that it would "regret it fast" if it continued to threaten america or its allies. police have arrested a 27—year—old man on suspicion of a double murder in golders green.

police investigating the death of an 83—year—old man, stabbed whilst walking his dog, have arrested a man in his 20s. in sport, watford hold liverpool to a dramatic late 3—3 draw in the opening game of the new premier league season. all the 3pm kickoffs are league season. all the 3pm kickoffs a re goalless league season. all the 3pm kickoffs are goalless so far. usain bolt anchors jamaica to a place in the final of the 4 x 100m relay at the world championships. and britain's women's 4 x 100 team qualified as well, finishing second in their heats in. fact all british relay teams are through to their respective finals. more on those stories in an hour. more now on president trump issuing another warning to north korea over its nuclear weapons programme. dr

colin alexander is an expert in east asian political communications and is based at nottingham trent university and joins us now. thank you forjoining us this afternoon on bbc news. first off, yes, things have moved on quite a bit, but the most fascinating thing is that the likes of china having to step in as mediators, what do you make of this? yes, china tends to step in to these scenarios. china has reasonable relations with the united states these days and also is north korea's main, some would say only, ally. it's the obvious choice. as a superpower nation it holds a lot of clout as well. but why does china not appear to take a more aggressive, diplomatic stance or action against north korea? well, i would suggest that china's saying that both sides need to use diplomacy here. that they need to,

that both sides have an argument and that both sides have an argument and that both sides are able to approach the diplomatic table and discuss this. i think that adding further aggression tot equation is unwise. and china's approach to this, i think, is pretty worthwhile. so china are stepping in. you've got angela merkel saying,ory i consider an escalation of rhetoric the wrong answer " an escalation of rhetoric the wrong answer." how exactly do you solve a problem like north korea? what is the problem with north korea? it depends really — the problem with north korea? it depends really - carry on, sorry. i mean, north korea has, like any other state in the world, has a right to defend itself from aggression, no matter what that aggression, no matter what that aggression may be. so you can say that north korea is a problem, but then, you can also say that the

united states and its actions are also a problem. so what do you make of north korea testing these intercontinental missiles and very openly targeting us borders and her allies? is that 0k in your opinion? well, it's only suggested the issue of guam and it has hinted in the past at alaska. if you look at what is said, they said they were firing into the sea. they're not specifically saying they're going to endanger life. how do you think this is going to pan out? good question. i think that like the other stand—offs that we've had, this will dissipate, that, and you know, i go back to the original point that you've made, that this is really just rhetoric. it's chest beating from the two, certainly from the two presidents. i think that eventually

it will be mediated and it will play out. i don't think that we're remotely close to any sort of nuclear conflict. 0k. well, we'll see, won't we. thank you very much. two legends of athletics will run their last major competitive track races at the world championships in london tonight. mo farah will be hoping to win his second gold of the games when he runs in the 5,000 metres. usain bolt will retire after taking part in the relay with the jamaican team. let's get more now from our sports correspondent 0lly foster, who's at the london stadium. goodness, what an evening of sport lies ahead. yeah, in the space of about an hour—and—a—half, we're going to bid farewell to two legends, greats, mo farah, possibly the greatest distance runner of all time. usain bolt, the greatest

sprinter of all time. when you take into account 0lympic sprinter of all time. when you take into account olympic games and world championships, 29 gold medals between them. sir month farah, knighted for —— mo farah, knighted for his services to athletics, where he's looking to bow out on the track. he's not retiring. he won that brutal 10,000 metres race on the opening evening here. he's looking to double up once again, something that he's done so many times. he's looking to do it for a third time, a fourth time actually at world athletics championships, third time. he's done it twice in the olympics as well. it's going to be very, very tough because the kenyans, the ethiopians have been really wanting, trying u nsuccessfully really wanting, trying unsuccessfully to knock him off his perch. you feel he will not want to bow out on the track before he turns his attentions to marathon running, with a defeat here in one of his favourite stadiums. 2012, where it

all began, those glorious — the double he did at the london olympics five years ago. such fondness from the crowd for him. they will be right behind him once again tonight. that's 8. 20pm. for britain, the only medal so farfor us. that's 8. 20pm. for britain, the only medal so far for us. yes, just the one gold medal. it's been a bit lean. lots of fourths, some fifths and sixths. lots of encouraging performances from fairly young athletes getting into finals and that will probably be the argument when they have a postmortem that this will be a transitional squad. nojessica this will be a transitional squad. no jessica ennis—hill or greg rutherford. 0f no jessica ennis—hill or greg rutherford. of course, usain bolt goesin rutherford. of course, usain bolt goes in the 4 x 100m relay as well. he came flying through his heat with jamaica this morning. very, very rare that he does actually take part in the heats. but they're leaving

nothing to chance. the jamaicans have absolutely dominated this event with usain bolt at the helm — 19 gold medals, many of them in relays for usain bolt. he's looking to bow out. that will be it. his retirement with a 20th gold medal. but this is a very, very big but, justin gatlin and christian coleman, the two americans who pushed him into bronze last saturday night, a week ago, remember that — spoiled the script, not the script they wanted according to lord coe, the president of the iaaf, as the americans spoiled that particular party in the 100, the americans, with gatlin and coleman, they looked extremely quick in qualifying for the final. it's likely that america could be top of the podium once again. not perhaps the podium once again. not perhaps the way usain bolt will want to go out but he'll be doing his all to go out but he'll be doing his all to go out with a gold as well. we will be

tuning into that. that's later this evening. thank you for that. the union unite has warned that strike action by refuse workers in birmingham, which has left waste piling up in the streets, could continue until christmas. the union has said it will ballot its members to renew its mandate for industrial action, after the current round of strikes end on september 21. itjust keeps mounting up. six weeks of strike action by refuse workers has left some streets in birmingham full of bin bags and vulnerable to vermin. now the union behind the action, unite, says it will ballot its members on continuing that action all the way until christmas. right, it's been about four weeks now, we've had bin bags literally lying everywhere, we've got recyctable waste in the houses building up everywhere. it's terrible, we just need it gone. as soon as they can, just take it away and get rid of it. the row with birmingham city council

over changes to the waste service has deepened, with the council accusing unite of holding the city to ransom. it says it must modernise, saving millions of pounds in the process, and also that no—one will lose jobs. workers say they're facing the prospect of less money if they're forced into different roles. the council is proposing to take safety—critical responsibilities off bin loaders at the back of a bin wagon, endangering my members and the public. but in doing so, and there will be a cost to my members' income of between £3,500 to £5,000 a person. they are already on low incomes, and they simply cannot afford it. it's stalemate, but the patience of residents dealing with the consequences is running out. hundreds of white supremacists have clashed with anti—fascist demonstrators in the american city of charlottesville. the violence occurred following a torch—lit rally, to protest a decision to remove a statue of the confederate general robert e lee.

in february, charlottesville city council in virginia voted to remove statues that marked confederate leaders from the american civil war. a small village in the cotswolds has been taking part in a landmark dna study to trace their family histories — with some surprising results. more than 100 villagers from bledington were tested as part of the genetics experiment, asjeremy stern reports. everyone seems to know each other in bledington, but it turns out that people in this tiny cotswolds village are even more close—knit than they thought. brenda found out herfriend graham is also her fourth cousin. definitely a surprise, yes. i mean, i had no idea. all of them were surprises because we have only been here 12 years. and they said i was the most related person in the village. the link was made through dna taken by a company which maps family histories.

saliva samples were provided by 120 residents. that is about one quarter of the village's population. bledington looks like the quintessential english village. we were keen to see what diversity we could find within bledington, just as an example of what you can find all over britain. we explored a few villages like bledington, nearby and around the country, and once we started talking to the people within the village and met with the parish council, they were so excited about the project that for us, it was the obvious choice. yet the results were anything but obvious. it turns out that as a whole, the residents in this most english of villages are less than 50% english. very interesting, because it tells you the percentage of britishness, how much of you is from europe or ireland. we are not completely british. the links stretch across the globe, from the cotswolds to the caucasus,

the middle east back to middle england. stargazers will be hoping to get a great view of the perseid meteor shower tonight. astronomers say hundreds of meteors will streak across the sky in a display that may be visible around the world. the display should peak at around 11pm. clear skies permitting, it will be seen in most parts of the uk. with an update on the all important weather, here is darren bett. hello, a few showers heading into the evening, especially the north and east of scotland, north—east england down to lincolnshire too. sharp ones for a while. they tend to fade away for a while. they tend to fade away for most overnight it will be dry and clear. the wind is falling light as well. a pretty good night to see

the meteor shower. temperatures fall away quickly in the countryside. across the north it's chilly overnight. not much cloud as we head into sunday morning. a bright, sunny start for most. a few showers from the word go, perhaps western scotla nd the word go, perhaps western scotland developing more widely in scotland, mainly north of the central belt. the odd shower with a bit more cloud across wales and the south—west. northern ireland, northern and eastern england likely to be dry, a sunnier day than today and drier across northern england. temperatures on par with what we had today. not far off the average for this time of the year. looking ahead to next week, nothing is settled. some sunshine around at times. turning wetter for monday and probably later on wednesday into thursday and maybe even into friday. hello, this is bbc news. the headlines.