self-initiated

Ms Gunney said the case of Alex Hutton, 19, from Swansea highlighted the "very prevalent" threat of "self-initiated" extremism.

In a wide ranging interview before the prime minister's announcement, Ms Gunney said violent material on the internet was contributing to "self-initiated terrorism".

"The risk of somebody becoming a self-initiated terrorist, so actually just taking that material and making their own minds up about something, and going out and committing action that isn't organised or co-ordinated by a wider group of people - that's probably one of the biggest risks we've got in the UK at the moment," Ms Gunney added.

This "pick and mix of horror" was sometimes coupled with terrorist material, with a continuing threat from "self-initiated terrorists" radicalised online.

State Department said on Thursday it had undertaken a "self-initiated 60-day internal security review" in which it was uncovered that its contractor "may have removed, retained and transmitted classified national defense information without authorization."