'Jihadi John’ Unmasking Raises Questions for British Security Services

The identity of the masked man who has appeared in several Islamic State videos showing the beheading of foreign hostages has been widely reported as Kuwaiti-born Briton Mohammed Emwazi. He was previously known to British security services -- and questions are now being asked of why they did not prevent him from traveling to Syria. Henry Ridgwell reports from London.

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