The operation was launched as part of an investigation conducted by the İstanbul Chief Public Prosecutor’s Office.
Prosecutors alleged that seven of those targeted had used ByLock, a messaging application Turkish authorities have treated as evidence of Gülen movement affiliation in post-coup investigations.
Two others were accused of making social media posts praising the coup attempt.
Teams from the İstanbul Police Department’s Security Branch carried out morning raids to detain those named in the investigation.
Six people were taken into custody, while three others remained at large.
The report said three of those targeted had previously been dismissed from public service and one had resigned from their position.
Ankara blames the coup attempt on the Gülen movement, a transnational civic initiative inspired by Islamic scholar Fethullah Gülen, and designates the movement as a terrorist organization. The movement denies involvement in the coup or any terrorist activity.
