Turkish prosecutors ordered the arrest of 300 suspects in an investigation of military personnel linked to FETÖ who orchestrated an attempted coup in 2016, state-run Anadolu news agency said on Friday.
Anadolu said 211 of those facing detention were serving military personnel.
FETÖ and its U.S.-based leader Fetullah Gulen orchestrated the defeated coup on July 15, 2016, which left 250 people martyred and nearly 2,200 injured.
Ankara also accuses FETÖ of being behind a long-running campaign to overthrow the state through the infiltration of Turkish institutions, particularly the military, police, and judiciary.