Turkish police detained 38 people, some of them are Syrian citizens, over suspected links to Islamic State in an operation on Thursday in the northwestern province of Bursa, the state-run Anadolu news agency said.
Counter-terrorism police carried out simultaneous raids on homes in various districts of Bursa, smashing doors open with battering rams and searching the properties, it said.
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Islamic State militants have carried out gun and bomb attacks in Turkey. Many foreign fighters passed through Turkey in recent years on their way to join the jihadist group in territory it controlled in Syria and Iraq.