Young men are increasingly the focus of our security agencies - as they're captured by extremist content online. 

That's according to the boss of the Security Intelligence Service, who fronted MPs at Parliament yesterday. 

Massey University Senior Fellow at the Centre for Defence and Security Studies, John Battersby, says many of those being radicalised are isolated. 

"I think we're probably talking about a fairly small minority of individuals who possibly don't feel they belong somewhere - a little bit detached from the real world.

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