Prime Minister David Cameron will on Friday call on Muslim communities and families to do more to help tackle extremism, warning that some risk encouraging young people to be radicalised by giving weight to such views.

Cameron will highlight two cases this week - a 17-year-old from Northern England who blew himself up in Iraq and three sisters who abandoned their husbands and are believed to be bound for Syria with their nine children - as examples of how people can slide from prejudice to extremism.

He will tell a security conference that people who, by way of example, believe democracy is wrong, women are inferior and religious doctrine trumps the rule of law, share the ideology of Islamist extremists.

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