In this grab taken from video made available by @HLOBlog, a man is surrounded by police after an incident on London Bridge, in London, Friday, Nov. 29, 2019. A man wearing a fake explosive vest stabbed several people before being tackled by members of the public and then shot dead by armed officers on London Bridge, police and the city’s mayor say. Police say they are treating it as a terrorist attack. (@HLOBlog via AP)