Two Turkish security officials are facing investigation over last year's murder of Turkish Armenian journalist Hrant Dink, state-run news agency Anatolian said on Sunday.
The pair, named only as Colonel A.O. and Captain M.Y., are suspected of "hiding information and failing to act" on reports Dink was in danger, Anatolian quoted Trabzon governor Nuri Okutan as saying.
The probe is one of the first into allegations that police failed to act on a tip off about the threat to Dink, who was shot dead outside his Istanbul office in January 2007.
According to the court indictment, one of the defendants in the Dink case acted as a police informer and told police of plans to assassinate the editor in the months before the murder.
Dink received numerous death threats due to articles urging Turkey to accept responsibility for its part in the mass killings of Armenians by Ottoman Turks and Kurds in 1915.
The investigation comes as the military is under increasing scrutiny following a wave of detentions and arrests that have targeted several retired army officers for allegedly planning a coup to topple to ruling AK Party.