President Tayyip Erdogan has said Gulen's followers were behind the coup on Friday night that attempted to topple him.
Erdogan has said the cleric, who lives in self-imposed exile in the United States, is trying to build a "parallel structure" in the judiciary and army to try to overthrow the state, which Gulen denies. (Reporting by Gulsen Solaker; Asli Kandemir and Ece Toksabay; Writing by David Dolan; Editing by Catherine Evans)