Reports from Turkey say three Russian nationals have been detained for suspected links with the Islamic State (IS) group.
Police in the Mediterranean city of Antalya also seized documents and CDs during a search of the premises where the suspects were staying, the Dogan news agency reported on January 13.
The suspects were allegedly in contact with IS militants in conflict zones and had provided logistical support to the group.
Russia's Consulate-General in Antalya confirmed that three Russians had been detained, adding that the reasons for the move were being clarified.
News of the detentions came a day after a suspected IS member killed 10 Germans and wounded 15 others in a suicide bomb attack in Istanbul.
Russia's Foreign Ministry said in November that more than 2,700 Russians had left for Syria to fight for the IS group. Of these, 160 have been killed, 73 have returned and been tried, and 36 have been arrested.