Transcript for London terror
They were gonna start with that breaking news from London a large event plowing into pedestrians near a mosque. In the north of the capital city this video shot right after the incident took place. The man with the ripped shirt was taken into custody and see there two other people possibly involved somehow got away. That's straight emergency responders performed CPR on victims at the scene but at least one person was killed and several others injured. The mayor of London is being blunt about this he's calling it a horrific terrorist attack. Investigators. Have been at the scene for several hours now and ABC's Molly hunter was there as well she's back in our bureau and joins us live with the latest Molly what are you learning. Kenneth sank it -- that's right we just got back we arrived on the scene about two hours after that attack and the way it went down according to eyewitnesses so. After prayers got out in Hamas that was right there of course. There was a group of people surrounding a man on the ground and it's unclear whether he had a heart attack or something with going on that he was already on the ground. So when that white van careened around the corner turned on to a one way street and accelerated. There was ardea crowd of people waiting now. This attacker clearly knew who he was targeting he knew where they would be he knew that. Hundreds of people would be outside that mosque and hundreds of Muslims would be outside of that month. At that time that banning Kenneth. The important part about the mayor's statement if he says she thinks he calls it hurts attack and he called it a deliberate attack. And every eyewitness that we spoke with on the grad completely agree with but there was no doubt in their mind who this attack was targeting. And what he was they said look we have to Conley was he with the terrorists and he targeted. It was. Fastening being Aaron the anger is still really heated this morning dining Kenneth. And mining up police are still on the scene still combing that whole area what do you get the sense is a next step in the investigation. Sit and what's interesting is that police are not confirming that there were additional people in that and every eyewitness that we spoke with that I said that Everett the -- and in that and one driver who we know was arrested we've seen dramatic video of that arrest and two other guys and has to either guys. Apparently got out within seconds that that van turned so police are gonna try to figure out potentially who that other person live. But also because they have this guy now in custody they can ask him questions they can interrogate him of course so figuring out what the motive was who this was. But the other thing about this attack if it happened under a minute every single eyewitness said that it happened in up the last sit trying to figure. How this guy knew exactly where to go who he wed there a lot of unanswered questions this morning. And quite unusual that they were so many people out after midnight there in London apparently this guy might have known that they might be there Molly hunter there for us have our London bureau at the latest thank you.
This transcript has been automatically generated and may not be 100% accurate.