Hawzah News Agency (Istanbul, Turkey) - "All of those detained were foreign nationals", it said, without giving details on when the detentions took place, Reuters reported.

Daesh (ISIL or ISIS) terrorist group has carried out numerous bombings across Turkey in recent years, including an attack on a nightclub in Istanbul in which 39 people were killed and a bombing in the city's historic heart that killed 12.

Turkish operations against Daesh suspects intensified at the end of last year on the anniversary of the nightclub shooting.