Transcript for Manchester attacker identified as 22-year-old Salman Abedi: Police

This is an ABC news special. George Stephanopoulos. Won't take you straight to Manchester England chief constable of Manchester police Ian Hopkins very instant favorite mantras that. I kind of stuff by woods today expressing my. Sincere condolences to the families of those that have lost that left wounds in this atrocity. We can't have a team of specifically trained from the gaze of officers working with the news from police and supporting them. The has been much speculation in the media handled social media has the names that some of the victims. The loss except that some of this is an inevitability. Would oust the people to allow us to work with the corridor. And to work with those harmonies and ensure that they'll probably supports it before we release the names of those that is sadly lost their lives. As you would expect the police response across Christ's righteousness has been significance today. As we help people to continue to go about their daily business and lead that lives here in greater Manchester. Plots of this response I say this arrest the 23 year old man in connection with the attack. And we've also carried out to Lawrence warning bully grange a warning followed field. The warning followed field did serious undertaking controlled explosion. To gain entry McCain I just wish to reassure those communities that was something that we were doing to gain safe access that's the thing to be concerned about acts. We understand that feelings are very rule right. And that people prior to be looking for offices. However mall and at. It is vital diverse communities. That make great tonight justice such a strong place. Actually stand together and support each other as we will be doing individual 6 PM this evening. We will therefore not tolerate hate towards any thoughts about community. I should communities to suffering from hate incidents of crime that I would please urge them to reported to us. At this afternoon as you so we resisted by the home secretary Theresa may. And the home secretary. I'm a road. Both of whom were given a briefing by our ongoing operations. The investigation over today in the next few days. I can confirm that the man suspected of carrying out lost rights atrocity. Base 22 year old Solomon a speedy. However he has not yet been formally named by the current I wouldn't wish to that full comment any further bars him at this stage. Hot priority along with a police catch terrorist network and I security problems is to continue to. Establish whether he was acting alone or working as parts of a wider network. Thank you for legislation. So there you have it right here the chief constable of the Manchester please Ian Hopkins. Making a plea for peace in that counts in the town of Manchester multi cultural town will not tolerate. Hate of course this comes in the wake of that attack last night the PR Arianna grinding concert twenty to get 59 injured. Or all news anchor David Muir is on the scene there. In Manchester David as these costs will just said there's a major vigil coming forward in the next couple of hours from that city to come together. You're actually right Georgia Tech you can see some of the people gathering for that vigil. A right here behind me it's actually gonna begin in about 45 minutes or so and expected to last a well into the evening with the key things we heard. Just now is that this suspect that they have zeroed it Nam reached preliminary identification of 22 year old Solomon up Betty. Although he said he's not formally been named by the Korea. So he did one offer any more details about the suspect but the key question torture as you know for investigators at this point. Is whether or not he was acting alone or part of some larger network that had planned this and of course the numbers here are just simply staggering 22 killed 59 injured. And as you heard him talk about going. But he's not using great sensitivity when talking about these families and you can understand when you're here or why he said that because we're learning today that some of the youngest victims. Work eight your soul a little girl so many families had brought their children to that Arianna grinding concert George Burnett or began to unfold. They sure did yeah that's right it was so hard to see many of us who brought our kids to consciously got to achieve those who of course my Brian Ross here. As well as David said they in the constable. Does not know yet whether he was acting alone or with but there has been. Another arrest in two other warrants for searches that's right there wasn't arrested the 23 year old man name unknown at this point and they are looking deceive anybody helped a B. Build what was a suicide bomb that takes some planning and some sophistication. In terms of larger numbers there are 500. Active terror investigations underway right now is Great Britain this just one of them. What we do know is that prices is claimed responsibility. They have some responsibility they called him a soldier of the cal and that he killed 100 crusaders that's the words of of the axis site Twitter. Terry so much shock Terry Moran. He arena in so many people had no idea what was happening. They didn't Georgia it was a joyous moment and think of that crowd Arianna grounded fan base. Teenagers young girls there moms are talking parrot to a waiting outside and heard that bomb go along. And bought the worst. I had at that moment as you see in those pictures those pink balloons that it come down from the sky as part of the final. From the roof as part of the final song. Are all through the arena now blocking the exits. An outside parents desperately trying to get to their kids I talked to one father who sent that he ran up the stairs rammed through that crowd that was fleeing. Finally saw his daughter grabbed her and he told me. It was like she was born again it was like the data truthful. Some concerns and our own law enforcement that this place was specifically target because there'd be so many young women. And families there David before we go to given your back in Manchester as you said the vigil. Is coming up and you'll be reporting from their tonight. We will be reporting from here tonight George and the world is really reacting to what. It's now seen here in Manchester as you mentioned George so. A related offer for at least back in the United States who do this you know with their own families take their loved ones to these concerts and I'm I want to share with you. As we close here something that the prime minister trees and may as you know she came to Manchester today something she said to the people here in the U case to the people of Manchester fallen victim. To an attack that targeted some of the youngest people in our society. Cold calculation which is perhaps why this is resonating so deeply here. The victims were so terribly young to us we are tracking all the latest you'll be back for world news tonight David Muir. Have good afternoon. This has been a special. For me he's.

This transcript has been automatically generated and may not be 100% accurate.