"Thousands of fighters are re- turning to Bosnia from Syria and Iraq and pose a serious threat for the whole of Europe”. This warning, issued last December by Croatian President Kolinda Grabar-Kitarovic, led to a diplomatic crisis between Zagreb and Sarajevo. For Bosnia-Herzegovina’s security minister, the “thousands” figure was an exaggeration. The risk is nevertheless a real one: Islamic extremism is affecting a growing minority among the approximately 8.5 million Muslims who live in the Balkan states. 

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