Police in Turkey’s central Anatolian province of Kayseri arrested 52 teachers who were found to be using ByLock, a smartphone messaging application or what Turkish prosecutors calls the top communication tool among the members of Gulen Movement, on Saturday.

The movement is accused by the government of masterminding the coup attempt on July 15.

Kayseri police detained 128 teachers over their use of ByLock over the past week. The court in charge ruled on arrests of 52 of them while 15 others were released on probation, on Saturday.

53 of the teachers had been arrested and the remaining 8 released on probation, on Friday.

Turkey has already arrested around 22,000 and detained 43,000 people over coup charges. Arrestees include journalists, academics, teachers, doctors, court personnel, military and police officers.