welcome to bbc news, broadcasting to viewers in north america and around the globe. i'm gavin grey. our top stories: the uk's terror threat level is raised as the hunt goes on for the person who planted a bomb on a rush—hour train in london. the joint terrorism analysis centre, the independent organisation which is responsible for setting the threat level on the basis of available intelligence, has now decided to raise the national threat level from severe to critical. it's the fifth terror attack in the uk this year. the so—called islamic state group says it planted the device which injured 29 people. north korea's leader says his country will meet its nuclear ambitions despite sanctions, after the un strongly condemned friday's missile test. and the cassini space probe plunges into saturn, also we bring you a special report on the stories of those who survived the devastation of hurricane irma in

the devastation of hurricane irma in the caribbean. hello and welcome to bbc world news. britain is at its highest terror threat level following friday's tube bombing in london. there will be additional patrols in busy areas and landmarks. 29 people were injured when the home—made device exploded at parsons green station. it is thought it didn't detonate as intended, the train was heading towards central london. on the floor of the tube, still in flames, it was supposed to blow up the carriage. that bag is on fire. it caused panic, fear, some injuries, but thankfully it didn't kill. guys, let's get away and move to the end of the platform. at 8:20am, this train, packed with commuters, had just arrived at parsons green.

it was loud enough to make me wonder what the bang was, and i looked round and this wall of fire was just coming towards us. i turned left and i saw the fireball surge towards my side. luke walmsley was in the carriage listening to music. a bang and then a flash to my left. almost immediately, sort of a surge of people screaming and running towards me. the improvised bomb was in a white bucket, with wires attached, in a lidl freezer bag. david nelson saw it partially detonate. lots of schoolchildren, there was a flash of light inside there was a flash of light inside the carriage, just a wave and a burst of flame. and after you saw the flames, what happened? panic. everyone pushing to get off. luckily

the doors were open, we have just got into the station. and then a bit chaotic, people being thrown everywhere, being trampled. there we re everywhere, being trampled. there were people running over, a lot of people within the carriage watching to get outside the train, i was hoping to see —— i could see people jumping off the train station, towards the end of the carriage. passengers on the train behind were helped down the tracks. children had their school journey interrupted in their school journey interrupted in the most frightening manner. within minutes, armed police, fire crews and ambulances arrived. it was clear there were some injuries. no—one allowed through here, yeah? burns and, from the stampede after, nearly 30 taken to hospital. this woman's commute to work ending in a very different way. relieved to be safe. peter suffered burns to his head. there was a fireball above my head,

and there was a lot of people with facial burns and sinn share like myself. the worst casualties i saw was a man with a pufferjacket, that had melted wind back. —— in the back. a large area around parsons green tube station has been cordoned off and this afternoon the police announced they were evacuating local residents living closest to it, to allow them to try and make that device left on the train a bit more stable. as so—called islamic state said it carried out this terror attack, the police hunted the would—be bomber and the terror threat level to the uk was raised. the joint terrorism analysis centre, the independent organisation which is responsible for setting the threat level on the basis of available intelligence, has now decided to raise the national threat level from severe to critical. this means that their assessment is that a further attack may be imminent. the army will now replace police

officers at some locations, as hundreds of detectives search for who planted this bomb. this is a very complex investigation which is continuing at speed we are making excellent progress as we extend our lines of enquiry to apprehend those responsible. this is a very complex investigation which is continuing at speed with the full weight of the london counterterrorism policing resources assisted by colleagues from around the country and our intelligence agency partners, such as mi5. for those who walked out of the tube carriage today, there is, of course, relief. lucky, i will go home and give my wife and kids at the couple tonight. hgppy wife and kids at the couple tonight. happy to be here. —— kids are big cuddle. but with a bomber on the run and fears that another attack could be imminent, these are tense times for those whose job it is to catch him. the bomb is being examined by forensic teams

and officers are looking through cctv at the station for clues about who planted it. our security correspondent gordon corera reports. the device at the heart of the investigation. the ongoing hunt for the person who planted it has now led to the uk's threat level moving up to critical — its highest level. the makeshift bomb will have yielded some clues in that hunt. like these wires coming from the bucket, used to try and trigger an explosion. they look similar to these christmas tree lights that a birmingham man planned to use in a home—made device before he was arrested. such improvised devices do not always go off properly. that was the case on july 21st, 2005. experts believe today's bomb also didn't explode as intended. the size of the device that was employed was quite significant. and had that device functioned in its intended

and designed mode, we'd have seen considerable casualties. many people injured and probably many people killed. the explosive may have been a compound called tatp. this footage from brussels airport and metro shows the devastation when it detonates properly, more than 30 were killed. it's also thought to have been used in the manchester arena attack this year. that involved a suicide bomber. but today's attacker wanted to get away and used a timer. that is similar to damon smith, seen here leaving a timed device at north greenwich a year ago, which was spotted before it went off. today, hundreds of counterterrorism detectives have been deployed in this investigation. they've been forensically analysing this device, looking for fingerprints and dna. they've also been scouring cctv images, looking for an individual carrying this bag onto the tube and then getting off without it. that will have been the starting

point for their manhunt. mi5 are helping the investigation. they will want to know if the individual was part of a group or acted alone and, as has often been the case recently, if they were previously known to authorities. unfortunately it would not be a surprise and this concept of a lone wolf now would more accurately be described as a known wolf. increasingly attacks, when they happen, have been committed by individuals who were known in some way to either the counterterrorism police or mi5 beforehand. 0fficials here have reacted with irritation to this tweet from donald trump: theresa may responded that it was never helpful to speculate about an ongoing investigation. for the fifth time this year,

the country is dealing with the aftermath of a terrorist attack. and tonight, with no sign yet of an arrest, officials felt they had to raise the threat level amid fears the danger has not yet passed. you can keep up—to—date with the manhunt in london, following the parsons green attack, by going to our website where there is also more eyewitness accounts and analysis. just click on our website bbc.com/news or download the bbc news app. let's take a look at some of the other stories making the news. hundreds of protestors have been blocking streets of the us city of st louis in missouri. they are protesting against the acquittal of former police officerjason stockley — who is white — from a murder charge following the 2011 shooting of anthony lamar smith, who was black. more than 500 protesters marched

chanting "no justice, no peace," and some held "black lives matter" signs. the parliament of iraq's autonomous kurdish region has voted to go ahead with a controversial referendum on independence in ten days time. the country's central government in baghdad, which is very much against any move that might lead to the kurdish area breaking away, says the referendum is unconstitutional. the prime minister of iceland has called for a snap election after a party quit the coalition government over a judicial scandal. bjarni benediktsson said he preferred the election to be held in november, almost a year after the last snap vote which was triggered by the panama papers scandal. the united nations security council has again condemned north korea for carrying out what it called a "highly provocative" missile test on friday. however, there was no mention in the un statement of any further sanctions. the north korean leader, kim jong—un, has announced that his country's nuclear

programmes will continue, despite sanctions, in order to have an "equilibrium" with the united states. bill hayton reports. north korea is celebrating, another successful test for its hwasong—i2 ballistic missile, and kim jong—un was there to congratulate the scientists. he told them it was his aim to establish a "balance of force" with the united states, so it cannot threaten his country with military action. but on a visit to an airbase near washington, president trump said the us would never be intimidated. after seeing your capabilities and commitment here today, i am more confident than ever that our options in addressing this threat are both effective and overwhelming. in new york, the un security council discussed the situation for the second time this week.

this time, there was no new resolution, only a press statement strongly condemning the missile launch, and urging compliance with existing sanctions. and russia says the us has to get serious about talks with north korea. we called on our us partners and others, to implement political and diplomatic solutions that are provided for in the resolution, and without implementing this we also will consider it as non—compliance with the resolution, not fully implementing the resolution. but as russia and china urge patience, the us says it is running out of time. it wants an end to north korea's missile and nuclear programmes, but with those programmes making rapid progress, the choices facing world leaders are becoming more difficult. stay with us on bbc news, still to come:

a special film featuring the bbc‘s coverage of hurricane irma as it wreaked destruction on the islands of the caribbean. freedom itself was attacked this morning, and freedom will be defended. the united states will hunt down and punish those responsible. bishop tutu now becomes spiritual leader of 100,000 anglicans here — of the blacks in soweto township, as well as the whites, in their rich suburbs. we say to you today, in a loud and a clear voice, enough of blood and tears — enough! translation: the difficult decision we reached together was one that required great and exceptional courage. it's an exodus of up to 60,000 people, caused by the uneven pace

of political change in eastern europe. iam free! hurricane irma has devastated the caribbean islands, and british overseas territories in the region are particularly hard hit. the rescue effort started slowly and will take years to complete. the bbc we re will take years to complete. the bbc were there and the first on the ground on the island of barbuda as a mass evacuation was taking place. here is a special extended report. when not coping, we definitely not coping. what we can live and do? my whole life is here, so...

describe the nightly, what happened? it started off with a win. it wasn't like life—threatening than, it started picking up and then it came m, started picking up and then it came in, the rain, and the wind picked up harder and harder. at the time i was sleeping and my brothers woke me up, the windows blown open, and he started pulling on the roof and i was holding him, we were fighting the wind. the roof came off. then my bedroom came off. we went in the living room. we had all of this boarded—up.

the british virgin islands look like they have been hit by the blast wave ofa they have been hit by the blast wave of a bomb. 0n the biggest island, houses have been ripped apart. people talk about the windows if it came from another world. we had to leave. the wind picked us up. in the moment it was like life was on the line. the roof came off. walls were keeping an. —— caving in. the wind pulled a child out of a mother's

hand. that was the last they saw of the child. tonight was restless. you could not get to sleep. you were up all night. everything just started to decay and just crumble. what have you eaten in the last few days? nothing stopping you cannot cook or anything. you have to have a biscuit, tea or water, or whatever. what do you do now? i have no idea. everyone now with homeless. no one has any to go. everyone is in the same situation. and no one can help each other. everybody needs help. the object of this morning is to

make sure we get every single resident off barbuda. we now have a mandatory evacuation in place. we are telling the people to vacate the island. we cannot afford a situation in which barbuda is hit by yet another hurricane in these conditions. don't worry. we will get you off the island to safety. you will be ok. the sheer horrifying scale of the damage means barely a building can be salvaged. the government has admitted it simply does not have the money to rebuild

the entire island. we are calling on international partners to assist us. have you got enough food, water? no. everybody is fighting and stealing. people are breaking into people's homes and taking what they have. it isa homes and taking what they have. it is a state of emergencies. yelling. when it came to the opening of this supermarket just an hour ago, when it came to the opening of this supermarketjust an hour ago, we witnessed shocking scenes. people we re witnessed shocking scenes. people were waiting eight hours in very hot weather. they are looking for water and canned food. when it comes to the local ministers, they told me it is simply not true that people are hungry. but i have been here on this island for the last five days and thatis

island for the last five days and that is not what they are telling me. i have seen real determination, but now what i am seeing is real desperation. we need water and food. this is an emergency. have you had enough help? i don't think so. no help. you can go down there for a bit. we are fine. we are under control. but we did not expect this mess today. we onlyjust got out of out mess today. we onlyjust got out of our house today. as we were filming, a local government minister approached. we have lots of good writing tonight. this market and other markets and lots of food arriving every day this week. we are

trying to make some phone calls. how have things been for you? really difficult. there is no food or water. some people are bringing help. but we haven't seen anything. they are or agonising the logistics. while that happens, people are suffering. —— organising. the food is finished. we have more children. it is tough. we have been told not to walk too far up this street because the number of serious prisoners is still high after the damaged prison. when you walk around this neighbourhood you get a real senseit this neighbourhood you get a real sense it is notjust about rebuilding lives and homes, it is about rebuilding trust. hi. is this where you live?|j hi. is this where you live? i live right around the corner. hi. is this where you live? i live

right around the cornerlj hi. is this where you live? i live right around the corner. i am feeling hungry. is it acceptable that seven days after the hurricane there is limited food and water. you have a lot coming in today. today is seven days after the hurricane. people have not had water for seven days. i can tell you the uk has made a huge effort. i have just talked to the premier, he says we have enough for months. we are intensifying the effort. most people would say the uk has made an absolutely stunning effort to get support to the island and help bring more water after what has been an unprecedented natural catastrophe. this was the bar here. first i have

to get it cleared up. a lot of work. do you think you have got the money to do it? no. white sands is one of the most exclusive beaches on the british virgin islands. everything you see used to be a bar, a restau ra nt, you see used to be a bar, a restaurant, the income of someone. everything has to be rebuilt if it is to survive. it has basically been a community effort to rebuild. the experts will give us the ability to

rebuild in a way that we want, because in many ways, we did what we could in terms of building. the fact we have built something this substantial is due to them. but if we asa substantial is due to them. but if we as a community come together we can have a community shelter, which we don't have as of now by the way. have you got the determination to do this? do we have the determination! you ask a very simple question. we have the determination. this is not only determination, it is a challenge. we have so much potential. i mean, look at these kid. they have gone through a traumatic experience but they are not as traumatised as you would expect. i think when everyone who needs to leave or would like to leave gets off the island which will happen pretty soon, i think the rest of us can really refocus our efforts on what needs to be done. that is how people go past. you are

alive, there is hope. if we have any animosity among anyone of us, this is the time to come together and get stronger and move on. and i think we have to keep hope alive. and when we do that, we are going to make it. hurricanes 0mar‘s trail of destruction is vast, and yet the caribbean spirit prevails. —— hurricane irma. as our team walk the streets, so many told us the same message, they are simply grateful to be alive. that report from laura bicker on the very destructive power of hurricane

irma and the desperate clinging—on to rebuild from the islanders. this is bbc news. hello. after several days of quite cool, showery weather, only subtle changes taking place this weekend. there will be fewer showers around by the time we get to sunday. throughout the weekend, occasional sunshine. in it, it feels quite pleasant. in the showers, it feels quite cold. some quite chilly nights around, as well. perhaps a touch of frost in a few places. it is chilly because there has been a flow of air from the north. high pressure to the west of us, low pressure to the east. the air coming down from the north of these pressure systems, and it's unstable air, bringing showers. a few of the showers for western parts of wales, cornwall, devon, a few near north sea coast zones, into northern scotland, as well. but away from the showery areas, and most of us will be away from the showery areas, we're likely to start the day with some pleasant sunshine. just some areas of cloud and there, but where you've been clear for any period of time overnight, it will be a chilly start. so temperatures are only gradually recovering as we go through the morning.

it is still on the breezy side. you'll certainly notice that across northern scotland, and here we're getting a fair few showers coming in on that stiff breeze. so on through the day, then, where you start with some sunshine, the cloud is going to build. there'll be the threat of a shower. where you start cloudy, you may well see the sunshine come out for a time, but there is still the threat of a shower. and it could be we see a longer spell of rain moving into parts of western scotland and into northern ireland. the showers get going elsewhere. there could be some heavy downpours around, especially across some eastern parts of england, that could come with a rumble of thunder. but everywhere at risk of getting at least one shower moving through that may be heavy. temperatures into the mid—teens. now, as we go on through into the evening, the chance again for another spell of rain, this time affecting parts of wales, south—west england. and even overnight, saturday night into sunday, there could be some heavy rain for some into south—west england, maybe around lion bay. heavy showers close to the south coast, whereas many other places will become dry, and it is going to be much cooler in rural spots compared with towns and city centres.

for some in scotland, maybe northern ireland too, we will get close to freezing, for a touch of frost as sunday begins. maybe one or two mist and fog patches, because there are lighter winds for part two of the weekend, on sunday. as high pressure begins to nudge in, and it will give mainly dry weather to scotland, northern ireland, variable cloud. wales and western england will see relatively few showers, but elsewhere across england, a scattering of showers that could be on the heavy side, but by no means everyone will get one. with lighter winds, more seeing some sunshine. it will feel a little bit warmer by the time we get to sunday. but monday and tuesday is looking pretty quiet. not many showers at all, quite a bit of cloud, a little bit of sunshine. this is bbc news — the headlines: britain's prime minister has raised the country's terror threat assessment to the highest level following a bomb explosion on a rush—hour train in london. theresa may said security analysts

had concluded that a further attack might be imminent — and there would be more armed police on the streets. the united nations security council has strongly condemned north korea for carrying out its latest missile test — calling it ‘highly provocative'. but after an emergency meeting — the un said there would no further sanctions for now. north korea fired a missile over japan for the second time this month. after twenty years in space, the cassini mission to the ringed planet saturn has come to a spectacular end. the probe had run out of fuel — and the us space agency nasa had commanded it to destroy itself by plunging into the planet's atmosphere. now on bbc news: in the last two years, three saudi princes in europe have disappeared.