MI5 and anti-terrorism police are monitoring more than 3,000 homegrown Islamist extremists willing to carry out attacks in Britain, security sources have told The Times.

British men and women, many in their teens, are being radicalized to the point of violence within weeks.

Investigators have also detected a significant overlap between Islamist suspects and those suffering mental health problems, leaving them vulnerable to grooming. The NHS now has full-time staff attached to the anti-extremism Prevent program who try to identify signs of extremist behavior.
Source: MENA