tonight, breaking news. the deadly terror attack in london. people running for their lives. a van plowing into pedestrians on london bridge. then the stabbing spree at a crowded outdoor market. how some took on the terrorists. inside the plot. the urgent investigation tonight. more on those decoy suicide vests, and why the terrorists may have chosen to strike now. brian ross with breaking news on their identities. plus, president trump slamming the mayor of london over his response. taking to twitter, and claiming the attacks are more evidence america needs his travel ban. on edge. the stampede sparked by a loud bang. the crush for the exits. more than 1,500 injuries. high alert abroad and at home.

and, carry on. ariana grande back on stage in the uk less than two weeks after the deadly concert bombing. we're live as they send a message to the world. good evening. thanks for joining us on this sunday, i'm tom llamas. and we begin with breaking news in the london terror attack. an apparent claim of responsibility by isis. calling the terrorists fighters of the islamic state. a chaotic eight minutes, with a van running down pedestrians, on london bridge. and then a stabbing spree. seven people die, dozens more injured. some tonight fighting for their lives. first responders, swarming, opening fire. killing the attackers, who were wearing fake suicide vests. to the north, a star-studded tribute in manchester.

ariana grande leading a superstar lineup, in a benefit for uk terror victims less than two weeks after a deadly attack at her concert there. and the response from president trump and authorities overseas. here in the u.s., on high alert. the coverage from london. >> reporter: eight minutes. londoners today reckoning with what happened in those eight chaotic minutes of terror that shattered a summer night. >> and then some guy comes around the corner and went, "run! run! run! they got blades, knifes, they are gonna stab you. they are terrorists. run!" >> reporter: it began at 10:08 p.m. a white van heading south on london bridge suddenly swerves off the road up on the sidewalk and accelerates, running down pedestrians, leaving them broken and bloodied on the pavement. >> it's indescribable, the state they were in. you never think you're going to see something like that. >> reporter: the bbc's holly jones just happened to be

on the bridge. >> this is when i saw the driver of the vehicle and -- definitely intentional. he didn't look scared, he looked focused and i'd almost like to say the word demented. >> reporter: that van coming to a stop at the south end of london bridge. >> we heard a crash almost. >> loud noise. >> a lot of loud noises. >> reporter: three men get out, armed with long knives, head towards the bustling borough market, and begin slashing and stabbing people indiscriminately. >> they said that "this is for allah." all three of them ran up, just like that. everywhere, just stabbing all over. >> reporter: elisabeth o'neil's son daniel was there and survived an attack. >> and a man went up to him and said this is for my family, this is for islam and stuck a knife straight in him. he's got a seven-inch scar going from his belly round to his back. >> reporter: in the streets, panic. >> i just saw loads of people run away from the market and there was people lying on the ground. >> reporter: police swarming the scene, ordering terrified

patrons in restaurants to take cover. >> get down! >> reporter: police quickly corner the suspects. then a hail of gunfire. >> oh, my god! >> reporter: all told, 50 shots fired by officers. and all three attackers, dead on the ground, each wearing what looked like suicide vests, but were fakes, meant to spread terror. it was 10:16 p.m. eight minutes. the injured on the ground, first responders applying pressure to stem the bleeding from the knife wounds. of the 48 people admitted to hospitals, 21 are in critical condition. >> would you please leave the area for your own safety! >> reporter: terrified crowds, hustled to safety, told by police to keep their hands on their heads. this, the third attack in the uk in three months. prime minister theresa may addressing her people, vowing tougher anti-terror measures. >> we cannot and must not pretend that things can continue as they are. things need to change.

>> reporter: that killer van, towed away late today, while the survivors count their blessings. >> i'm just so, so lucky, you know? it was one meter away and i'm just so grateful, so thankful. i will never take my life for granted. >> and terry joins us live from one of the scenes of the attacks. so many stories emerging of regular people taking on the terrorists and fighting back. and tonight, one police officer in the hospital is being called a hero? >> reporter: we're learning more about several people who took on the attackers, using everything from chairs to pints of beer. the transport police officer, confronting all three attackers, armed only with his baton. seizing the initiative, saving lives. tonight, he's in the hospital, seriously injured, but recovering.

tom? >> thank you. more now on the unfolding investigation and the apparent isis claim of responsibility. a series of sweeps in east london leading to a dozen arrests. and new images of the terrorists wearing decoy suicide vests. abc news is learning the plot may have been in the works for months. here's brian ross. >> reporter: police tonight say they already know a lot about the plot and the plotters. they moved quickly today into this working class east london neighborhood, making at least 12 arrests. >> work is ongoing to understand more about them. about their connections, and about whether they were assisted or supported by anyone else. >> reporter: officials tell abc news that the three terrorists have been waiting for three months. and the trigger may have been this message posted by isis just yesterday, calling on followers to use vehicles, guns and knives to attack.

many of those arrested today were connected to the dead terrori terrorist here, seen wearing a fake bomb vest, intended to guarantee a police response that would lead to martyr dom. >> reporter: neighbors today told abc news the dead terrorist is of pakistani descent, the father of a toddler, with a wife who is expecting. others said he was known for radical views, complaining his local mosque was not devout enough. >> he said it was not a good mosque, it was not following the really muslim -- religion, muslim categories. >> reporter: the bbc tonight broadcast an interview with a neighbor who said he was so concerned about the man he called authorities. >> i did my bit, i know a lot of people did, but the authorities did not do their bit. >> reporter: with more than

3,000 potential terrorists on british watch lists, authorities say they simply cannot track every suspect or stop every attack. >> there have been 13 or 14 plots that have been foiled in the last 12 months. and we've probably got to be prepared for more. >> brian, now that isis has claimed responsibility, is there a fear of more attacks on the way? >> yes, authorities in britain see a wave of terror coming their way. isis has called on their followers to carry out as many attacks as possible during the month of ramadan. >> brian, thank you. and as we reported earlier, stories of heroism emerging. bystanders, confronting the attackers. good samaritans rushing to help the victims. several small memorials for the injured and dead are growing. but as eva pilgrim reports, many of the people targeted fought back.

>> reporter: tonight, chilling stories of survival and selflessness. >> all i could see was one man in the front, with a pool of blood on the ground. >> reporter: mark kinshew, trying to help a man caught in the crossfire. >> i took off my belt, and myself and the other man put the belt around sort of his head. to apply pressure and stop the bleeding. >> reporter: and the man who took this video of terrorists inching closer to packed bars and restaurants, british journalist geoff ho. moments later trying to fend off those terrorists attacking a bouncer, stabbed in the neck, but recovering tonight according to his colleagues at the "sunday express" who are calling him "our hero." survivors recalling moments of bravery. >> people get under wherever they can to get low. i look over and opposite, this guy is throwing a table at somebody. this heroic guy saw what was happening. and just bombarded these

cowardly people. >> reporter: among the dozens injured, marie bondeville and her boyfriend oliver dowling, brett freeman, stabbed four times, posting this photo. and this waitress, as well. what was the response like? >> well, he collapsed right outside a pub. >> the taxi driver said, you have to run, they've got a knife. >> and eva, london bridge just behind you. joining us live. citizens have had to suffer so much in the last two weeks. what is the sense you're getting from residents there? >> reporter: there's a somber mood in the city. london bridge now becoming a place for reflection for many.

tom? >> eva, thank you. and the terror attack prompting a stern response from the white house. president trump on twitter almost immediately doubling down on the need for his travel ban to keep americans safe. then lashing out at the mayor of london over something he said. a tweet many are questioning tonight. here's david wright. >> reporter: for president trump, these panicked scenes in london were an opportunity to settle old scores. the president's first instinct -- to plug his temporary travel ban on citizens of six muslim countries, a policy currently blocked by the courts. "we need to be smart, vigilant and tough," trump tweeted. "we need the courts to give us back our rights. we need the travel ban as an extra level of safety!" only later did trump express solidarity and support for the people of britain. then today, trump took aim at

london's mayor, sadiq khan. >> londoners will see an increased police presence today and over the course of the next few days. no reason to be alarmed. >> reporter: trump tweeted, "at least seven dead and 48 wounded in terror attack and mayor of london says there is no reason to be alarmed!" trump's tweet suggested khan was not concerned about the carnage. >> i'm appalled and furious that these twisted and cowardly terrorists deliberately targeted innocent londoners and visitors to our city who were just enjoying their saturday night. >> reporter: asked for a response, khan's office said, "he has more important things to do than respond to donald trump's ill-informed tweet that deliberately takes out of context his remarks." trump and khan have clashed before over the travel ban. >> i think the ban is cruel and shameful, and our prime minister should not be condoning it. khan called for trump's state visit to britain to be

cancelled. soon after, the white house agreed to postpone the trip. >> david, as the administration monitors what is happening in london, they're also preparing for what could be a critical week with james comey set to testify on capitol hill. >> reporter: that's right. and today, abc news learned at least as of now, the administration does not plan to try to invoke executive privilege to block comey's testimony. but they plan to offer some counter programming, with some big announcements about infrastructure. police on display across america, but events going on as planned. just with more precaution. here's kenneth moton. >> reporter: tonight, major cities in the u.s. on alert after the attacks in london. the fear -- a copycat. in new york city, visible signs of that stepped-up security, nypd heavy in times square. more patrols at airports, bridges, tunnels and mass transit.

chicago police armed with assault rifles at saturday night's u2 concert at soldier field. in oakland, game two of the nba finals between the golden state warriors and the cleveland cavaliers. police and security working to keep thousands of fans safe. in new york, large sanitation trucks lined up, ready to stop vehicles like the one used in the london bridge attack. these trucks protecting tens of thousands of people for sunday's celebrate israel parade. the concern, homegrown terror. investigations in all 50 states. the fbi saying 2,000 potential terrorists in the u.s., half of those may have had contact with terror groups like isis. in times square, scenes of more police, now common after a major terror attack overseas. across the nation, places where large crowds are gathering told to remain vigilant. tom? >> kenneth, thank you. still much more ahead on this special edition of "world news tonight" this sunday. hitting a high note.

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the stadium. standing up to terror. >> i got hit, but it didn't stop me. >> i think it's good for us to be together. to stand together. and i think we all need this concert to feel better as well. >> reporter: police presence doubled. a so-called ring of steel encircling the venue, keeping the sellout crowd of 50,000 safe. stars including miley cyrus, katy perry, and coldplay also here. ♪ >> reporter: pharrell williams and miley cyrus leading the audience in a singalong of his hit, "happy." the most powerful moment came as this manchester high school choir took the stage.

this 12-year-old girl bringing the crowd to tears. ♪ you are my everything ♪ you are you are you are my everything ♪ >> reporter: so many tears tonight, but also so many smiles for a city that is still healing. and also tonight, the hope and determination definitely still. tom? >> lama, thank you. so far, that benefit concert raising more than $9 million. the concert will air tonight on abc after game two of the nba finals. coming up next, the latest on the police officer fighting for his life after being dragged for blocks by suspects behind the wheel. plus, the barrier-breaking moment on the big screen tonight. we'll be right back. when your pain reliever stops working, your whole day stops. awww. try this.

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what triggered this terrifying moment caught on camera. a dangerous stampede. some 1,500 people injured when soccer fans packing a main square in turin panicked. police say a loud firecracker may have set those fans off. this incident unfolding just about a half hour before the london terror attacks. and the new york city policeman dragged for nearly three blocks through the streets of brooklyn. that officer was questioning the driver of a honda sedan, when that car suddenly sped off. dragging the policeman, who managed to fire off two shots, hitting a 15-year-old suspect in the face. both the officer and teenager in critical condition tonight. that officer, a nine-year veteran with a wife and a 2-year-old daughter. and now to the superhero shattering box office records this weekend. "wonder woman," starring gal gadot. outmuscling the competition, more than $100 million in its debut. the biggest blockbuster ever directed by a woman, patty jenkins. when we come back, an

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finally tonight, we want to go back to manchester to show you an incredible moment. the uplifting ariana grande finale manchester fans will likely never forget. ♪ somewhere over the rainbow ♪ way up high ♪ there's somewhere that i've

heard of once in a lullabye ♪ ♪ somewhere over the rainbow ♪ skies are blue ♪ and the dreams that you dare to dream really do come true ♪ [ cheers and applause ] >> somewhere over the rainbow, in manchester tonight. thanks for watching. i'm tom llamas in new york. "gma" first thing in the morning. david muir right back here tomorrow night. have a great evening. good night.

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