Turkey's state-run news agency says police in the Mediterranean city of Antalya have detained three Russian nationals in a raid on suspected Islamic State militants.

The Anadolu Agency said anti-terrorism police conducted the raids on Wednesday, a day after an IS suicide bomber detonated a bomb in Istanbul's historic Sultanahmet district, killing 10 foreigners, most of them German tourists.

Anadolu said the suspects were allegedly in contact with IS fighters in conflict zones and had provided logistical support to the group.

Russian police have said that several thousand Russians are believed to have gone to Syria to join ISIS.