There are at least 2000 people in the UK who pose a threat to national security because of their support for terrorism,the head of MI5 reported.

Jonathan Evans said there had been a rise of 400 since November 2006.

He said children as young as 15 were being recruited for terrorist related activity by alQaeda.

http://news.bbc.co.uk/1/hi/uk/7078712.stm