The London Bridge broke the case, killing seven people, injuring forty people, killing three assaulters and arresting twelve people. British media reported that one of the suspects was a twenty-seven-year-old Pakistani-born Islamic extremist who had appeared in the UK last year on a documentary about Islamist extremists and argued for the Islamic flag and police officers in the park The Knowing his friends revealed that he often watched extremist content on YouTube, and in recent years had extreme ideas. And when he lived in eastern London, he tried to recruit children to join the Islamic state. The police reported at least two times, knew his existence, and knew that he had extreme thoughts, but did not take any action.