20 years ago in the civil war in Bosnia, hundreds of Arab jihadists came to join Bosnian Muslims fighting against their neighbours the Serbs and Croats. Grouped into secret fighting units in Central Bosnia, this was the first time in centuries Jihad had been fought against a Western, Christian enemy. Two decades later Bosnia is still reaping the consequences. In the past month ISIS declared the Balkans the next front of Jihad - and in remote mountain villages extremists are flying the ISIS flag. Mark Urban returns to Bosnia and discovers how secular Bosnian society has been infiltrated by a militant Islamism which operates to this day.
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