this is bbc news. i'm julian worricker. the headlines at "pm: the terror threat is raised to critical, meaning an attack is imminent, after a bombing on a london tube train during the morning rush hour. 29 people were injured. the islamic state group say they carried out the attack. the prime minister urges us to be calm but vigilant. the public will see more armed police on the transport network and on our streets, providing extra protection. a manhunt is launched. commuters caught up in the attack tell of a large explosion on the train. this fireball is just going over your head and everybody screaming. massive banging occurred. i didn't what happened, looked around and the first thing you saw was an orange fireball encompassing the first thing you saw was an orange fire ball encompassing the whole first thing you saw was an orange fireball encompassing the whole tube coming towards you. sirens injapan, after north korea fires another missile over the country, to international condemnation.

and a bittersweet end to a space mission which circled saturn for 13 years sending back never before seen images. and coming up on newsnight: the government increases the national—security threat level to critical, meaning an attack is expected imminently. what do we know about who was behind the day's explosion? we are inside a rohingya refugee camp. and an adviser on theresa may's new book. good evening. welcome. the terror threat in the uk has been raised to the highest level, critical, meaning an

attack may be imminent. it follows a bombing on a tube train in london during this morning's rush hour which the police are describing as a "terrorist incident". 29 people have been treated in hospital, some suffering from burns. it happened as a district line tube train pulled into the overground station at parsons green, in south—west london, at 08:20 this morning. the bbc understands that the bomb, described as a homemade device, had been fitted with a timer, but it failed to fully detonate. whoever planted it is still on the run. 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 moved 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 surged 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 on the way to school. noticed this flash of light over the other side of the carriage. felt this heatwave and then just like a burst of flames. after you saw the flames what happened ? panic. everyone pushing to get off. luckily the doors were open because we'd just

popped into the station. then a bit chaotic, people being thrown everywhere, people being trampled. there was people running over other people within the carriage. when i got outside the train i was able to see people, like, jumping off the train station towards the end of the carriage. passengers on the train behind were helped down the tracks. children had their schooljourney 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. 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 crowley suffered burns to his head. there was a fireball above my head and there was a lot of people

with facial burns and singed hair like myself. worst casualty eyesore, a gentleman, who had a pufferjacket that had all melted at 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 attacks, 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 plan this bomb. —— planted. we are making excellent progress at the moment as we pursue our lines of inquiry to identify, locate and arrest those responsible. this is a very complex investigation which is contining 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'll go home, give my wife and kids a big cuddle tonight. happy to be here. 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. lucy manning, bbc

news, parsons green. well, the head of counter—terrorism says hundreds of detectives are now involved in the investigation. the bomb is being examined by forensic teams and officers are looking through cctv at the station for clues as to who planted it. our security correspondent gordon corera takes a closer look now at the investigation and where it might lead. the device at the heart of the investigation. the ongoing hunt for the person who planted it is now leading 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 decimates properly, more than 30 were killed. it's 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. the attacks 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. our home affairs correspondent daniel sandford gave us this update from outside scotland yard. just an hour justan hourand just an hour and a half ago the assista nt just an hour and a half ago the assistant commissioner in charge of fighting terrorism across the uk talked about hunting the suspects down and i think this is the most significant terrorism manhunt that london has seen since those failed bombings of the 21st ofjuly, 2005.

counter—terrorism detectives are keeping their cards pretty close to their chest tonight. for example, haven't taken the option of going public with an image of their suspect and asking for help in tracking them down from the public. they haven't said how much progress that made in working out when the bomb got on the train. 0r that made in working out when the bomb got on the train. or how much progress they have in getting the name of the suspect. from conversations i've had tonight, i get the impression that they are making good progress on all of those, they just don't making good progress on all of those, theyjust don't want making good progress on all of those, they just don't want to tell the public at this stage how much progress they are making. but of course the thing they haven't made progress on is actually capturing the suspects or any cost us is that he may have had and that will be concerning officers because there is a sense that london has been lucky today, that they've survived a tube bombing without anyone being killed at what officers will not want is for the luck to change. they won't wa nt to for the luck to change. they won't want to have a situation where this

bother p diddy accomplices actually succeed in carrying out another attack. —— where this bomber and any. north korea has fired another ballistic missile across japan, creating new tension in the region after its nuclear bomb test less than two weeks ago. the rocket travelled the furthest of any so far, more than 2,000 miles from sunan, over the japanese island of hokkaido, and into the pacific ocean. rupert wingfield hayes reports from niigata in japan. friday began with this very unpleasant wake—up call. speakers blared warnings. unpleasant wake—up call. speakers bla red warnings. commuters unpleasant wake—up call. speakers blared warnings. commuters were cleared from railway stations and trains halted. that's a nice wake-up call... foreign tourists were left bemused by what was going on. for above, a north korean missile was flying past. this behind me is the sea of japan. we've

flying past. this behind me is the sea ofjapan. we've come up here from tokyo because this is the place thatis from tokyo because this is the place that is most effective. this is where this morning they were woken up where this morning they were woken up by where this morning they were woken up by those sirens and by that message that a north korean missile was flying overhead. the people who live here in towns and cities and along this coast, this is the second time that has happened in less than three weeks. this afternoon we found this man playing with his young daughters and worried about how to protect them. translation: i want to protect them. translation: i want to protect my kids but we don't have a basement, we have nowhere to hide. a missile takes only ten minutes to reach japan. what can we do in ten minutes? this woman told me she's frustrated by japan's refusal to talk to north korea. translation: the sirensjust talk to north korea. translation: the sirens just scare people. there is nothing we can do. so what is the point? the government needs to have a real policy. it needs to talk to north korea. this is the type of

missile but will buy it. it flew further than any north korean rocket has gone before. in tokyo, shinzo abe marched out to face the cameras again. if it continues down this road, he said, north korea will have a dark future. but his words have an increasingly hollow ring. beneath this house, one person has taken matters into his own hands. behind the heavy steel door he takes me into his own nuclear bunker. translation: since this missile launchers began as had so many calls aboutair launchers began as had so many calls about air filtration system. i've had at least 800 enquiries this year. he is safe in his bunker, at the rest of japan is wondering what

it can do and when the next missile launch will come. the headlines on bbc news: the terror threat is raised to critical, meaning an attack is imminent, after a bombing on a london tube train during the morning rush hour. 29 people were injured. the islamic state group say they carried out the attack. the person who planted the device is still on the run. the un meets to discuss north korea's latest missile launch, after the us calls on beijing to take direct action. let's have a quick look at some of tomorrow's front pages. we start with the i, which carries a picture of a passenger caught up in today's attack on the london underground, declaring it was a lucky escape. the daily mail says the prime minister will call for internet companies to clamp down on extremists online. the paper claims the web providers have blood on their hands. the mirror shows a large picture of the device burning, which the paper says it is thought

was made using an explosive material called the mother of satan. the sun says police are hunting for the bomber, fearing more devices might be planted. the times leads with what it calls the power struggle between senior aides at buckingham palace and clarence house, the prince of wales's official residence. writing in tomorrow's telegraph, the foreign secretary says the uk will take £350 million a week from the eu to fund the nhs, a key pledge of the leave campaign in last year's referendum. the ft leads with the news that the pound climbed to its highest level since the referendum, following hints from the bank of england an interest rate rise might be on the cards sooner rather than later. we finish with the guardian, which focuses on the hunt for the london underground bomber, repeating the prime minister's comment that the attack was cowardly. the body of a british tourist killed in a suspected crocodile attack has

been found in a lagoon in south—eastern sri lanka. 24—year—old paul mcclean, who worked for the financial times, had been on holiday in arugam bay, and is believed to have been washing his hands in a lagoon when he was killed. in a statement, the paper said it was heartbroken over his death. the pressure on the government to lift its 1% pay cap on all public—sector workers has intensified. 14 health unions, representing nurses, midwives and ambulance workers, have demanded a rise in pay. in a letter to the chancellor, they called for an increase of nearly 4% for more than a million workers in the nhs. the government has said it wants their pay to be fair but also affordable to taxpayers. it is the pioneering spacecraft that has given us some of the most remarkable images ever seen of the planet saturn. for 13 years, cassini has documented extraordinary discoveries from its rings and moons, and transformed our understanding of the sixth planet from the sun.

today was its final mission, plunging into saturn's atmosphere at more than 75,000 mph, to be burnt up and destroyed. our science editor david shukman examines one of the most successful space explorations in history. it has been a journey that sounds like something from science fiction. nasa conjuring up animations of the cassini spacecraft flying around the spectacular rings of saturn. but this really did happen, and these are some of the images the mission actually captured. the planet seen from closer than ever before. the strange detail of its rings. a jetstream in the shape of a hexagon. and an utterly weird collection of moons. but today, the expedition had to come to an end. i'm going to call this the end of mission.

at mission control, in california, hugs and applause. for many, it has been the work of a lifetime, and no surprise there were very mixed feelings as the final signal reached earth. well, it's been a part of my life for 20 years. we've spent day in and day out thinking about cassini, planning the observations, focusing on the science. my career has been based on cassini, so it's really hard to see that go. saturn is the most distant world to have been explored for so long. and the cassini spacecraft, which is almost as big as a bus, has achieved something never attempted before. it has given us unprecedented views, and these have led to dozens of discoveries. the mission is described as one of the most remarkable journeys of exploration. while it has been orbiting saturn for a staggering 13 years. now, it is one of saturn's moons,

called enceladus, that has produced the most startling revelation. plumes of vapour were spotted blasting out of it. now, this turned out to be water. so let's take a closer look inside what we now know, that under a covering of ice, there is an ocean. and scientists have come to an amazing conclusion — that in here there is every ingredient needed for life. this opens up a whole new realm of possibilities in the search for life beyond earth. and the discovery of conditions on moons like enceladus is a real breakthrough for scientists like linda, who started her career at nasa three decades ago, when the mission began. we wanted to know, is there life on enceladus's ocean? could there be oceans inside of other moons? it will take future missions to go back and answer those questions. the mission captured these images of saturn's moon titan, and this is the sound the spacecraft recorded.

to make sure cassini didn't contaminate any of the worlds where there may be life, it was sent to its destruction. but it has raised some tantalising new questions. david shukman, bbc news. andrew coates, head of the planetary science group at university college london's mullard space science laboratory, told me about the highlights of cassini's mission. well, it is really difficult to actually choose that. it has been a wonderful mission, which has given us wonderful mission, which has given us lots and lots of interesting science data. i think there are really to make things which stand out, which have come to be really important —— two things. this is finding out about the means enceladus and titan. so enceladus orbit saturn close to saturn, four saturn radius is. it is water coming out from a subsurface ocean, it is a salty ocean, and there is activity

at the bottom of the ocean, and it looks like it may be habitable. that is an exciting thing coming out of the cassini mission. another is titan. so titan is a remarkable moon, the european space agency land in the probe on titan as part of a mission, and the mission itself looks at fly—bys, i20 fly—bys of titan, which found that this is really a n titan, which found that this is really an alien world. it has got a thick atmosphere. it is almost like a mini earth in the outer solar system. in fact, the atmosphere, which is very thick, made of nitrogen and methane, is like the early earth atmosphere. and we found ina papera early earth atmosphere. and we found in a paper a couple of weeks ago that there seems to be prebiotic chemistry going on in that atmosphere. so again, it looks like cassini is really changing our ideas of where there could be life elsewhere in the solar system. because we already know that mars is an interesting place, so we have the x0 mars rover going to mars in 2020

to drill down under the surface and look for signs of life there, and we are leading the camera team for that. but also the outer planet moons, so thejuice mission is going to euro plot and callisto and going into orbit around ganymede. —— europa. so based on the results from saturn, there may well be a follow—up to the saturn system as well. so it makes it a really exciting time for space exploration. in a moment it will be time for newsnight. but first, ben rich has the weather. hello. the cool and showery weather that has developed through the end of the week is what is going to take us of the week is what is going to take us into the start of the weekend. but gradually, slowly but surely, the showers will start to ease. there will be some sunny spells, but the nights, particularly, will be decidedly chilly. in fact, turning quite chilly out there through the rest of the night. some clear spells

around, showers continue through coasts of scotland and north east england, also wales and the far south—west. temperatures dipping to eight or nine degrees in big towns and cities out in the countryside, a little bit lower than that. tomorrow we will start off with some showers in north—east scotland and north east england. coastal parts of wales, devon and cornwall. many other areas. they fine and dry put into the afternoon, cloud will tend to bubble up. we will see showers breaking out quite widely, some of which will be heavy and thundery and afternoon highs of 12 to 16 degrees. in the sunday, a chilly start with a touch of frost, a few showers, more in the way of dry weather and sunshine. that bags on fire! the terror threat is raised to critical after a rush—hour attack intended, says the prime minister, to inflict significant harm. tonight, islamic state claimed responsibility as the police and security services conduct a manhunt. but the bomb didn't detonate properly. i'll be looking at the clues that gives us.

as more satellite images are released of more rohingya villages on fire, the international condemnation of aung san suu kyi grows and the suffering intensifies. translation: they beat the women mercilessly. then they locked the doors, poured petrol on the houses and set them on fire. and hillary clinton's published her apologia for losing the presidential election. bernie sanders — amongst others — gets it in the neck. what does her book say about the way she sees the world and about the future of the democrats? we'll ask clintons' former advisor. good evening. the uk terror threat stands at critical tonight for the second time this year after the fifth terrorist attack in six months. the islamic state claimed responsibility after an improvised