In June, Talha Asmal, a 17-year-old Muslim, became Britain's youngest suicide bomber. In a vehicle packed with explosives, Asmal and three other jihadists attacked Iraqi forces at an oil refinery in the northern town of Baiji. Eleven people were killed.

A few days later, three sisters from the city of Bradford left with their nine children – the youngest only 3-years-old -- for ISIS territory in Syria.

In the wake of these latest recruits to the jihadist cause, and a week before 30 British tourists were slaughtered on a Tunisian beach, Prime Minister David Cameron gave a speech at a security conference in Slovakia. Before a distinguished audience of politicians, academics, military officials and security experts from around the world, Cameron described ISIS as "one of the biggest threats our world has faced."

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