At least 4 people were detained in a Kayseri-based operation into the Gülen movement Friday.
Dogan news agency reported that the suspects are accused of raising financial support for the jailed supporters of the movement.
One of the suspects, identified as L.K., reportedly brought around TL 10,000 [$2,900] from Istanbul to Kayseri while the remaining three were supposed to distribute the money to their fellow friends in prison.
Turkish government blames the movement for the July 15, 2016 failed coup while the latter denies involvement.
More than 60,000 people have been jailed over Gulen links so far.