News reports from Turkey said police have detained at least 37 people with suspected links to the al-Qaida terror network.
The state-run Anatolia news agency said police raided suspected al-Qaida safe houses in five provinces early Tuesday.
Anatolia reported that several of the people apprehended in the south-central province of Gaziantep had received training at militant camps in Afghanistan.
Islamic radicals have carried out terror attacks in predominantly Muslim Turkey in the past. In 2003, al-Qaida militants killed more than 60 people and left hundreds injured in a series of bombings across Istanbul.
Some information for this report was provided by AFP and Reuters.