Islamic State militants could grow strong enough to target people on the streets of Britain unless a

Anyone "walking around with Isil flags or trying to recruit people to their terrorist cause" should be arrested.

It is estimated the group has up to 400 recruits from the UK, and some 69 people suspected of Syria-related jihadist activities have now been arrested in the UK.

But what more should be done in the UK to ensure the safety of the British Public?

BBC News