The Turkish intelligence agency MIT captured 10 suspected Islamic State militants in Syria and brought them back to Turkey, the Anadolu news agency on Saturday cited security sources as saying.
The sources said the suspects caught in the operation, carried out in coordination with Syrian intelligence, were linked to past attacks in Turkey.
One of the suspects - all of whom are of Turkish origin - had connections to the perpetrators of a 2015 bomb attack at Ankara train station in which more than 100 people were killed, state-owned Anadolu reported.
The sources said another of those detained had served as the group’s intelligence chief responsible for Turkey.
The suspects are accused of taking part in armed training, propaganda work and planning or supporting attacks, the sources added.
Reporting by Daren Butler