Metropolitan Police Commissioner Sir Mark Rowley said the Prevent anti-extremism programme has done "lots of good work" and said it was the system that failed.He told LBC: "The Prevent programme does lots of good work. Clearly, the Prevent officers didn't feel this was a case for them, that it was better dealt with by others."Pressed on why he would not say Prevent had failed, Sir Mark said it was the system that failed - somewhere between Prevent, local authorities and mental health.He added: "

Metropolitan Police Commissioner Sir Mark Rowley said the Prevent anti-extremism programme has done "lots of good work" and said it was the system that failed.He told LBC: "The Prevent programme does lots of good work. Clearly, the Prevent officers didn't feel this was a case for them, that it was better dealt with by others."Pressed on why he would not say Prevent had failed, Sir Mark said it was the system that failed - somewhere between Prevent, local authorities and mental health.He added: "We're never going to stop every young violent man. We need to be as good as possible at it, and there are too many men, young men, online, obsessing about this violent material."Some of that's about how we intervene with individuals, some of that's about the rules for online material and what people can digest and watch and that's part of the challenge."