At least 21 people have been detained during a police raid on a prep school established by teachers who were earlier removed from their jobs over their alleged ties to the Gulen movement.

Anti-terror police in Turkey’s western province of Denizli raided a tutoring centre in Merkezefendi district on accusations that it was set up and being operated illegally, media said Friday.

18 high school graduates who are preparing for the nationwide university admission exam were detained along with 3 teachers that previously had their teaching licenses cancelled by the government.

The prep school was shut down during the operation.

While the students were released after questioning, the teachers were awaiting the prosecutor’s decision at the time of writing.

More than 150,000 people have passed through custody while 90,000 were remanded in pre-trial detention since the summer of 2016. Meanwhile, over 150,000 have lost their jobs since then. Some 3,000 education institutions, among them several universities, dormitories, prep schools and private colleges were shut down over Gulen links.