this is a special edition of "nightline." "concert terror attack." tonight -- >> oh my god. >> stories of heroism from that horrific night. >> i thought my girls were dead. and then -- i thought, i can't let this little girl die. >> after the deadly suicide bombing in an ariana grande concert in northern england. 22 lives lost. one of them only 8 years old. isis claiming responsibility. the terror threat raised to its highest level. plus the face of evil? "the sun" newspaper publishing the suspected suicide bomber's photo. his older brother taken into custody. police blasting their way into his home. now on the hunt for possible accomplices. as britain's prime minister warns another attack cou

imminent. this special edition of "nightline" will be right back.

this is a special edition of "nightline." "concert terror attack." >> good evening. we are dedicating our entire show to the fast-moving developments out of england in the wake of the horrific attack on the ariana grande concert. children, teens,

targeted. tonight the british prime minister has put the entire country on its highest threat level warning another attack could be imminent. meanwhile, we're learning much more about the suspect. we begin here tonight with abc terry moran in manchester, terry? >> reporter: dan, tonight manchester is quiet. it's been quiet all day. a great city subdued in shock and sorrow. about what happened right back there at the manchester arena. the terror attack at the end of aria ariana grande's concert. 22 dead, 59 injured, so many of the victims young people, teenagers, even children. we're learning more tonight about the 22-year-old british-born attacker and about those harrowing moments of carnage and courage and love. ♪ >> reporter: they came out on a school night to see their idol. thousands of teenage girls packing the arena.

just minutes after pop diva ariana grande finishes her encore, in a shower of pink balloons -- 10:33 p.m. the house lights come up. then the sound of the bomb. >> oh my god. [ bleep ]. what's going on? >> reporter: panic. >> oh my god! >> reporter: confusion. those pink balloons popping as the audience stampedes for the exits. girls clamber over railings, dropping into the crowd, desperate to escape. >> of course i freaked out, began running. >> we had to climb over chairs, rilings to get out of doors that were locked, we had to force them open. >> reporter: carol taylor was there with a friend and their children. >> it was just smoke and embers falling down from the roof and people were screaming. and we just ran. we ran and ran. >> reporter: bethany keeling was

bomb went off. >> saw like a flash. like an explosion flash. i grabbed my friend's hand and we just ran. but we looked and we could see the bodies on the floor. >> everybody around me just screamed. we just all ran. we didn't know what to do. we thought something might have gone off. >> reporter: victims lying where they'd fallen. the ground was streaked with blood. >> i thought we were going to die, it was horrendous. >> reporter: police believe british-born salman abeddi, 22 years old, dead nated a suicide bomb here in the area connecting the massive arena to the nearby train station. it took the lives of 22 people, 12 of them children, injuring 59 more. the "son" newspaper publishing abedi's photo. among the lives loves 18-year-old georgina callander, a student studying health and social care. this picture of her with 18 yawn that grande taken eight years ago. and

being separated from her mother and teacher. remembered as simply a beautiful little girl in everress aspect of the world loved by everyone. according to news reports her mother is critically injured and still in the hospital, she might not even know what happened to saffie. devastating news to the family of 15-year-old olivia campbell, who just this evening was confirmed dead. her uncle steven hotson and her mother had been searching the last 24 hours. olivia's mother charlotte clutching a picture of her daughter. >> if anybody has seen her, please contact the police. >> reporter: earlier today making this plea. >> i'm going through hell. i can't even explain what i'm going through. i just -- i need my daughter home. i need to know where she is. a mother shouldn't have to do this. >> reporter: charlotte posting on facebook just hours ago, rip my darling, precious, gorgeous girl, taken far, far too soon,

smiling, mommy loves you so much. among the horrow, heroism. >> i kept talking to her telling her, you're going to be okay, darling. >> reporter: parents kim and phil dicks sprang into action, saving a 14-year-old girl's life as they frantically searched for their own daughter and granddaughter. >> she was screaming out in pain. her little arms and legs were all just broken, i ka tell. she was in so much pain, bleeding so bad. i couldn't believe it. i thought my girls were dead. then i -- but i thought, i can't let this little girl die. >> reporter: kim cradles the girl for nearly an hour, applying pressure to her wounds. even managing to contact her father and thankfully kim's own family was safe and sound. >> all the time i was holding and trying to be brave, i said, i'm not going did leave you until your dad, until we find your daddy, until he comes. >> reporter: joe gregory was in his car waiting to pick up his girlfriend. he sees the flash. hears the bang. then it hitsim

>> reporter: when the bomb went off, many parents were waiting outside to collect their kids after the show. for some of the youngsters, it was their first concert. pick hayward plunged into the fleeing crowd searching for his daughter kaitlin. >> i was outside, just outside the venue itself, when we heard a massive bang. inside you're thinking, what am i going to do, what am i going to do, what am i going to do? then you've got to think, i'm going to find her. that moment when i was working my way out the steps of what am i going to find? in the back of your mind you're thinking the worst. >> then you saw her? >> oh, huge relief. huge relief, huge relief. almost like she'd been born again. as dad, you must know that moment, yeah? this is the best moment of my life. it was that all over again. >> reporter: 60 ambulances screeched to the scene, specialized teams rushing in, transporting patients to area hospitals. >> call an ambulance, quickly! >> they were able to stabilize patients at the scene and assure they received the right treatment at the

evacuation to the hospital. >> reporter: children as young as 8 still unaccounted for as authorities try to frantically reunite families. among the missing, clowe rutherford and liam curry. courtney boyle and boyfriend philip trap. martin hepp separated from his friends. and wendy fall, who hasn't been seen since the concert. many taking their search to social media, pleading with users to help find the people still unaccounted for. for some, the social media pleas are working. this tweet indicating, all of these people have been found, let's keep going. the uk is now raising their terror threat level to critical, warning that more attacks could be imminent. >> there is a possibility we cannot ignore that there is a wider group of individuals linked to this attack. >> reporter: manchester police, interpol, and uk law enforcement all in a frantic search to determine if the suspect had accomplices. >> part of this response has seen us arrest a 23-year-old man in connection with the attack. >> reporter: a neighbor filming to

raided the suspect's modest brick home, armed with rifles and shields. >> unconfirmed reports of a gentleman, mid to late 20s, being removed from the address quite quickly by armed officers. >> reporter: in the midst of all this fear and loss, the humanity of the people in manchester is on full display. taxi drivers gave free rides to those trying to escape. local businesses and residents offered a warm bed, a spot of tea. ariana grande tweeted right after the concert, broken. from the bottom of my heart i am so, so sorry. i don't have words. today grande landing back in the u.s., greeted by her family and boca raton, florida. around the world and at home, leaders condemning the heinous attacks. >> so many young, beautiful, innocent people living and enjoying their lives, murdered by evil losers in life. i won't call them monsrs

because they would like that term. >> reporter: isis has claimed responsibility for this attack. >> although they claim responsibility for virtually every attack, we have not verified yet the connection. >> reporter: at home in the u.s., authorities are on high alert. they've beefed up security at vulnerable open venues ranging from sporting events to concerts. all around the world, signs of solidarity. the eiffel tower. the colosseum in rome. dark in honor of the lives lost. and here in manchester, there's an unbreakable spirit as hundreds gather to honor the 22 killed. >> whatever our religion, whatever our beliefs or our politics, we will stand together. >> reporter: not, not even terror, can shake their will to carry on. >> it's just sort of in our blood here. you just get on with it. >> events in france and england, we've got to stand together and don't change. because they want us to change, don't they? they want us to hide. they want us to stay

to be frightened of going to concerts and soccer games. we're not going to do that. >> reporter: for "nightline," i'm terry moran in manchester, england. next here, who was the 22-year-old accused of carrying out this bloody attack? and was he part of a larger cell? abc's chief investigative correspondent on the case. with type 2 diabetes a lower a1c is a lot about choices. but it can be hard sometimes, 'cause different sides of you struggle with which ones to make. well, what if you kept making good ones? then? you could love your numbers. discover once-daily invokana®, a pill used along with diet and exercise to significantly lower blood sugar in adults with type 2 diabetes. it's proven to lower a1c better than januvia®. invokana® works around the clock by sending some sugar out of your body through the process of urination. it's not for lowering systolic blood pressure or weight loss,

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>> jimmy: welcome back to a special decision of "nightline." as we're learning key details about the suspect in the attack on the ariana grande concert in manchester, england. the question tonight, did he act

here's abc's chief investigative correspondent brian ross. >> reporter: the london tabloid "the sun" published the first picture tonight of the man it said was the bomber. goo-year-old salman abedi, born in britain to parents from libya. tuesday in the frantic search to see if others were involved with him, police blew open the door of his manchester home, looking for evidence including his phone and computer. among the items officers removed, a book entitled "know your chemicals." >> he's looking at whether the dead terrorist is acting alone or part of a group. >> reporter: authorities want to know if abedi used videos, posted by isis this year, with instructions how to build a lethal suicide bomb. >> i think the use of a bomb here as opposed to a car or a knife demonstrates a much higher degree of sophistication by this individual. really suggesting that he probably did not act alone. that he certainly had some advice on how to

bomb. >> reporter: there is a huge and active isis presence in libya. and u.s. authorities believe abedi may have recently traveled there. at one point, abedi was on the radar of british intelligence. as a possible terror threat. one of thousands of young men under such suspicion. >> abedi was a terrorist suspect in the uk. mi5 were aware of him, aware he posed a potential threat. but they didn't think he posed the imminent threat he obviously proved himself to do in manchester. >> reporter: the manchester neighborhood where abedi lived, around an area called mossside a few miles from the concert arena, is considered by police to be a hotbed of isis acruitment. >> mossside is very well known. a lot of people with petty criminal pasts, involvement in gangs, getting instead involved with isis later on. >> reporter: a man taken into custody, identified as the terrorist's older brother.

they saw in abedi's devoutly religious family that would suggest any ties to terrorism. >> no, of course not. there was no religion condoning, saying killing people is right. >> reporter: manchester police have actually been planning for a terrorist attack. this training exercise was held just last year at a manchester shopping mall to help police prepare their response to a suicide bombing on a crowded soft target. >> we've seen over the past that isis has targeted soft target. bars, restaurants, sports stadiums, now a concert. it really is a result of learning about how to create the most carnage possible. ♪ >> reporter: it was less than a year ago on a crowded saturday night at the pulse nightclub in orlando, florida, when an isis-inspired gunman easily got past limited security and opened fire. 49 people died in the worst mass shooting in u.s. history.

in paris, isis orchestrated the attack on a soccer stadium. at the bataclan concert hall, where a popular american rock group was performing. more than 130 were killed there. a perfect target for the terrorists. >> these are targets that represent western civilization. which they see as lascivious. which they see as counter to their very strict version of islam. >> reporter: both isis and al qaeda have been posting new calls for their followers to attack large gatherings any way they can. just two months ago, there was the attack with a driver mowing down pedestrians on the sidewalk of the parliament bridge in london. and last year the truck attack in nice, france, on bastille day. tonight -- >> oh my god. >> reporter: officials in great britain say the manchester attack, with a suicide bomb, showed more planning and

sophistication and evil. >> young teenage girls attending a concert. and they are now the target for an attack like this. really demonstrating how ruthless isis is. >> reporter: for "nightline," brian ross, abc news, new york. >> our thanks to brian ross. we turn to potential national security official richard clark, potential fbi special agent in charge, richard frankel. richard clarke, let me start with you. if this suspect was on a watch list, why was he not actually being watched? >> because there are test of thousands of people on watch lists. and all that can be done when someone is on a watch list is their electronic media use can be monitored, perhaps their phone calls can be monitored. you can't have eight agents following around 10,000, 20,000 people. and it takes eight agents or more to follow somebody around 24 hours a day. >> richard frankel, we've been talking for years about the problem of soft targets. it was horrifically displayed overnight in manchester. what do wre

problem? >> without getting into the tactics at nypd or other police departments use, we're pretty good here in the u.s. as far as soft targets. they do things that make it harder to attack those soft targets. but as we saw in times square it still can happen. it's really not the soft target that's the problem, it's pre-soft target. the concert was a soft target, but the area outside that soft target is actually where he struck. >> you're saying we can never protect the area outside of a soft target? >> you can, but as you protect that you go further out. you go further out. and you get to the point where how far out are you going to go before you're too far away? so it's hard. >> back to the suspect here, richard clarke. as you look at the facts coming in now, as we learn more about him, does your intuition tell you he was part of a larger cell? or that he acted alone? >> i think this is a pretty sophisticated bomb. i don't think he did it entirely by himself. and what british intelligence and police will be doing now is

his social media, his e-mail use, and seeing who else he was in regular contact with. you'll probably find out that there was a small cell, maybe just the brother, but maybe three or four other people. >> what do you make of the fact that at least the suspect was born in the uk, he grew up in that society, that he then allegedly attacked? >> some of the stuff we've seen over time from these attackers are that they're not the immigrant population. they're actually the next generation. going to the time squares bomber, the subway bomber here in new york. as we see in manchester. he was not an immigrant, he was born in manchester and has now joined the terrorist networks. >> richard clarke and richard frankel, thank you very much, really appreciate it. we'll be back with more "nightline," keep it here. (dog) mmm. this new beneful grain free is so healthy... oh! farm-raised chicken! mmm...that's some really good chicken. i don't think i've ever tasted chicken like this.

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the prime minister of england spoke eloquently today about what happened at that concert last night in manchester. she said, while the attack represented the worst of humanity, the response represented

the cowardice of the attacker, she said, met the bravery of the emergency services and the people of manchester. as we look at images of the people of manchester out in the streets today honoring the victims, we want to tell you our coverage of this still-developing story will continue throughout the night on abcnews.com and first thing in the morning on gma. for now, thank you very much for watching abc news and good night. >> welcome to whiz kids week. we've got a bunch of young people with big brains and big dreams here today, all of them trying to win a million dollars. can they do it? only one way to find out. let's play "who wants to be a millionaire." [cheers and applause] ♪ welcome to the show, everybody. it's whiz kids week here on "millionaire."

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