And it's radicalization that happens through a number of causes and that's why we put a lot of effort into trying to stop that radicalization and I think we need to do even more to try and stop that.

NPR: 2 min 45 sec

"I would ask parents of the children to really try and ensure that they stop them from coming anywhere near the railways, " he said.

BBC: Parents in summer safety warning

When asked if he thought he was vulnerable, he agreed, and said his parents tried to stop him going out "because when I go out people try to stitch me up".

BBC: Boxer Herbie Hide denies fight-rigging claims