Transcript for Eyewitness details terror attack
Moments ago, I spoke with American tourist Brad Miers who was at the scene overnight. Brad, fthank you for joining us. You're on a trip of a lifetime across Europe. You happened to be on London bridge. You tell us what you saw and heard? Sure. I was taking pictures on the London bridge, viewing the the tower bridge, a picturesque individual on the Thames river. I went to the river walk, on the north side of the lond bridge. Went down the stairs. About two minutes later, I heard a loud noise behind me. Saw a van on the pedestrian sidewalk where I had just been two minutes previously. It was going through the pedestrian crowd that was there. It continued on down. I saw at least one person jump into the water in order to avoid it. Saw people trying to get out of the way. Possibly vehicles were hit as well. A horrifying scene. Can you talk about the aftermath? Did you go back up there after you saw what had happened? I walked back up the stairs. Saw that at least two people were being attended to. By at least three or four passers by. Looking after them for T. About two minutes after that, the police rushed in from the north side of London. They ran through, just speeding past and I assume they went to where the van was in order to apprehend that person. That decision of yours to go down to take the stairs down two minutes before the van started plowing through people was a fateful one. This was a close call for you. Yes, it was. It's a chilling prospect to think a minor circumstance could have changed and I could have been right there. I doubt I could have gotten out of the way, to be honest. We're glad you're okay. We appreciate your time on a stressful day for you. Thank you so much. Yes, thank you.
This transcript has been automatically generated and may not be 100% accurate.