ANKARA, April 26 (Reuters) - Turkey issued detention orders for a thousand people and detained 803 of them in overnight operations across the country against the network of U.S.-based cleric Fethullah Gulen, who Turkey blames for last year's failed coup attempt.

Security sources said the operations targeted the network's structure in the police force, and most of those detained were police officers. Those detained would be taken to the capital Ankara, the sources added.

(Reporting by Ece Toksabay; Editing by Dominic Evans) ((ece.toksabay@tr.com; +90 312 2927022; Reuters Messaging: ece.toksabay.reuters.com@reuters.net))