Update 5: ‘A guy ran past me and stabbed cop with big knife‘
Update 4: Sky News confirms 2 dead in attack.
Update 3: Attack comes exactly 1 year after Brussels attack.
Update 2: Statement from mayor of London.
Update 1: Video from the scene (showing injured people).
One woman is confirmed dead. As of now it is possible that there were two attackers, one who drove a large vehicle into a crowd and seriously injured about 10 people, and a second who stabbed a police officer and was shot by other officers. It is of course possible it was one man who drove the vehicle, got out and then was shot. We are waiting for more clarification.
There also is unconfirmed information that the incident was warned about in a 4chan internet post from yesterday. Unconfirmed.