ISTANBUL (AP) — Turkey’s state-run news agency says the Istanbul chief prosecutor’s office has launched an investigation into 17 U.S.-based individuals, including Senate Democratic Leader Chuck Schumer, former U.S. Attorney Preet Bharara and ex-CIA director John Brennan, for their alleged links to cleric Fethullah Gulen.

Anadolu Agency says Saturday the probe was launched after a group of Turkish lawyers filed a criminal complaint.

It said the prosecutor’s office would investigate their links to Gulen’s movement, in a step that could lead to charges of attempting to overthrow the Turkish government and membership in a terror organization.

Turkey accuses Gulen, who is based in Pennsylvania, of orchestrating last summer’s failed coup and has designated his movement as a terror organization. Gulen denies involvement.