Islamic extremism is a social problem as well as a risk to security that will only be beaten with the help of far more people from Muslim communities, David Cameron and Theresa May have said as they unveiled their new strategy to deal with radicalisation.

The prime minister set out his thinking in a post on Facebook, as he announced plans to ban suspected extremists from working with children.

He will also extend powers that allow parents to request the cancellation of passports for their children if they are suspected of wanting to travel to fight for Islamic State (Isis), increasing the age limit from under-16s to under-18s.

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