Prosecutors on Friday issued arrest warrants for 14 former military officers for their suspected links to the Gülenist Terror Group (FETÖ), which orchestrated the 2016 coup attempt.

The warrants were issued by the Ankara Chief Public Prosecutor's Office as part of an ongoing probe into the group's infiltration of the Turkish army, according to a police source who spoke on the condition of anonymity.

The suspects, including 11 pilots, were personnel of the Turkish Air Force.

FETÖ and its U.S.-based leader Fetullah Gülen orchestrated a coup attempt on July 15, 2016, leaving 251 people dead and injuring nearly 2,200.

Ankara accuses FETÖ of being behind a long-running campaign to overthrow the government through the infiltration of Turkish institutions, particularly the military, police and judiciary.