Four Gülen-linked security officers, including the former chief of police of the province of Batman Hasan Ali Okan,have been arrested as part of an ongoing investigation into alleged wiretappings on Thrusday.

Earlier on Tuesday, 12 security officers had been taken into custody when police units raided various locations in 13 provinces across Turkey.

Turkish government officials have continuously expressed their determination to continue to lawfully fight against the Gülen Movement, which is led by the U.S.-based imam Fethullah Gülen, whose followers are accused of infiltrating state institutions to gain control of state mechanisms and illegal wiretapping, forgery of official documents and spying.

Fethullah Gülen, is a controversial imam living in rural Pennsylvania in self-imposed exile, who is at odds with the Turkish government wielding great influence inside the Turkish police forces and the top judiciary.