LONDON - A white van veered into people who were walking on London Bridge on Saturday and knocked over several people, a witness who saw the incident told Reuters."We were walking on the bridge and the van went up onto where people were walking," said the witness who did not want to give his name. "We saw a few being knocked over."The witness said some were hit from behind."They didn't even see it climbing on the pavement," said the witness. "The police came pretty quickly."