got the first call, these men in this van that we saw plowing into people deliberately swerve eight cross london bridge. then they ditched the van and with their knives -- >> why did they get out? >> we don't know at this stage. we know very little about them. we know they were swerving and hitting people purposefully. when we covered berlin they were plowing into people because there were so many bodies they couldn't move forward. i don't know if that was the theory. >> what would borough market have been like? >> it was a beautiful day in london, people were out drinking and eating. borough market has a lot of upscale food bars and lots of bars, restaurants and that was -- it was really very busy, speaking to a colleague who was there two hours before this all