The head of MI5 says it has become harder to determine whether terrorists are acting ideologically or due to other factors such as mental health. <br /> <br />Speaking in London, the security service’s Director General Ken McCallum also says would-be terrorists are more volatile and have a 'tenuous' grasp of their so-called ideologies. Report by Alibhaiz. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
