The state-run news agency says a court has brought military spying charges against nine officers suspected of blackmail and transmitting military secrets.
The Anatolia news agency says the nine were arraigned by a court in Istanbul early Thursday. CNN-Turk television said prosecutors were still questioning 10 other people, including four more soldiers.
The investigation grew out of a police probe earlier this year into a gang suspected of secretly filming and blackmailing high-ranking navy officers and other officials.
Officials have not commented on the investigation but media reports said investigators have seized CDs containing sensitive military documents that the suspects may have sold to foreign spy agencies.