The Ankara Chief Public Prosecutor’s Office has issued detention warrants for 29 former diplomats due to their alleged links to the Gülen group, which the government accuses of masterminding a coup attempt in 2016. The group denies any involvement.

According to state-run Anadolu news agency, police have detained 14 of the suspects in operations carried out in 15 different Turkish provinces.

The purge-victim diplomats are accused of cheating in Foreign Ministry entrance exams and using the ByLock messaging app, which is considered by the government to be a tool of secret communication among supporters of the Gülen group. The app was once widely available online including Apple’s and Google’s app stores.