介绍： BBC News. Hello, this is Jerry Smit. The man who stabbed two people to death in central London yesterday has been identified by police as a convicted terrorist who was freed on parole last year. Usman Khan was shot dead by armed officers after he was tackled by members of the public. The British Prime Ministe...

介绍： BBC News. Hello, this is Jerry Smit. The man who stabbed two people to death in central London yesterday has been identified by police as a convicted terrorist who was freed on parole last year. Usman Khan was shot dead by armed officers after he was tackled by members of the public. The British Prime Minister Boris Johnson said he had long argued that he was a mistake to let serious and violent criminals out of prison early. He said the public wanted to see appropriate sentences in force for such offenders. Speaking to the BBC, the mayor of London Sadiq Khan suggested that cuts in services by the government had played a role. I've seen personally as a former lawyer, as a former justice secretary, but also as the mayor, the consequences of huge cuts in the Ministry of Justice, the probation service being privatized, aside from the cuts in police and that must have an impact. Officials have praised the bravery of the people who confronted the attacker, some used improvised weapons. Simon Jones has the details.