He picks up one of the heads , according to police , and shows it to the camera . Police say Richard Walton , of UK , trained with a terror group in west London 33 . He was in a promotional video showing him holding a severed head , police say . The terror group said he 'd died , but he really was trying to return to the west London , where he was arrested , police say .
Police say Richard Walton , of UK , trained with a terror group in west London 33 . He was in a promotional video showing him holding a severed head , police say . The terror group said he 'd died , but he really was trying to return to the west London , where he was arrested , police say .