Nine tax inspectors were detained as part of an investigation into Gulen movement supporters in the southern province of Hatay on Wednesday.
Hatay police carried out operations at several locations and rounded up the nine suspects, some of whom were earlier dismissed from their jobs over Gulen links.
Turkish government blames Gulenists for the July 15, 2016 failed coup and calls them a terror group while the latter denies involvement and any terrorist activities.
More than 150,000 people have passed through custody while 80,000 were remanded in pre-trial detention since the summer of 2016. Meanwhile, over 150,000 have lost their jobs since then.