Turkish forces arrested eight in simultaneous raids early Tuesday in the Aksaray, Denizli, and Kocaeli provinces following a warrant for 13 suspects, said a police source, who asked not to be named due to restrictions on speaking to the media.

A lawyer and a pharmacist were among the suspects, the source said, adding that efforts are ongoing to catch the remaining suspects.

Separately, an on-duty lieutenant in the western Balikesir province was arrested under a warrant over his suspected phone calls with FETO terror group members, the governor's office said in a statement.

The statement said that the officer had been contacted "consecutively" by public telephones.

According to the Turkish government, the Fetullah Terrorist Organization (FETO) and its U.S.-based leader Fetullah Gulen orchestrated the defeated coup on July 15, 2016, which left 250 people martyred and nearly 2,200 injured.

Ankara also accuses FETO of being behind a long-running campaign to overthrow the state through the infiltration of Turkish institutions, particularly the military, police, and judiciary.