At least 15 teachers who have previoulsy been dismissed from profession with decress issued by the Turkish gov’t, were taken into custody over their alleged links to Turkey’s Gülen group, which the authorities accuses of masterminding a coup attempt last year.

The Public Prosecutor’s Office in the central Anatolian province of Aksaray issued on Thursday detention warrants for 20 teachers in four three Turkish provinces — Aksaray, Balıkesir, Erzincan — over their links to the group. 15 of them were detained later the same day.

A military coup attempt on July 15, 2016 killed 249 people and wounded more than a thousand others. Immediately after the putsch, the Justice and Development Party (AK Party) government along with President Recep Tayyip Erdoğan pinned the blame on the Gülen group and initiated a widespread purge aimed at cleansing sympathizers of the movement from within state institutions, dehumanizing its popular figures and putting them in custody.

The Turkish government detained more than 140,000 people over ties to the group which denies any involvement in the failed takeover on July 15, 2016.