The arrests came after prosecutors in central Konya and southeastern Gaziantep provinces issued warrants for 16 suspects -- including seven on-duty soldiers, one cadet and a suspected doctor -- for communicating with senior FETO members, including those in the army, via payphone.

In a Konya-based operation in five provinces, anti-terrorism police teams arrested four suspects.

Meanwhile, six more FETO suspects were arrested in the operations launched in Gaziantep and Osmaniye provinces.

FETO and its U.S.-based leader Fetullah Gulen orchestrated the defeated coup on July 15, 2016, which left 251 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.