Turkish police on Saturday detained 74 suspected Islamic State (IS) militants in Istanbul, local media reported.

Police launched simultaneous operations in 15 places in the city, seizing documents including attack plans linked to the militant group, Daily Sabah said.

Among the detainees are 73 foreigners who would be deported back to their countries respectively, the daily said, noting the interrogation of the Turkish suspects was ongoing.

Citing preliminary police report, the daily said the suspects were planning to join the IS in Syria and Iraq, where the group is suffering defeat.

Turkey has been hit by a series of suicide attacks carried out by IS militants since 2015 and the authorities have deported at least 5,000 suspected terrorists and banned 53,000 others from entering the country, press reports said.