On November 15, the indictment prepared by prosecutor Adem Akinci, who was leading the investigation, was submitted for the approval of the Ankara Chief Public Prosecutor's Office.
READ MORE: Turkey Completes Investigation Into Russian Ambassador Karlov's Murder — Reports
A total of eight people were arrested as part of the investigation, including four former police officers. Mustafa Timur Ozkan, the organizer of the photo exhibition where Karlov was killed, and the head of the publishing group Guru Medya, Hayreddin Aydinbas, were also arrested on charges of involvement in the murder.
The Turkish side has repeatedly voiced suspicions that the movement of Gulen, which Ankara considers as a terrorist organization responsible for the failed 2016 coup in the country, was linked to the attack.