Man wearing 'hoax explosive' shot dead in London Bridge attack

British police have shot dead a man who had strapped a fake bomb to his body and stabbed a number of people in what they said was a "terrorism incident" in the London Bridge area of the capital. A video posted on Twitter showed a group of about half a dozen men wrestling with someone on the ground on the sidewalk of the bridge. One of them backs away from the scene carrying a knife. There was a heavy police presence and the area was sealed off as helicopters circled above. Several buildings were put on lockdown. Al Jazeera's Catherine Stancl reports from London.