An Ankara prosecutor has issued detention warrants for a total of 100 former police officers over alleged use of a smart phone application known as ByLock, the state-run Anadolu news agency reported on Saturday.

According to the report, 63 of 100 police officers have so far been detained in simultaneous opetrations in 19 provinces as part of an investigation run by the Ankara Chief Prosecutor’s Office against the Gülen group, accused by the Turkish government of mounting a coup attempt last year.

The movement denies any involvement.

Turkish authorities believe that ByLock is a communication tool among followers of the Gülen group.

Tens of thousands of people, including civil servants, police officers, soldiers, businessmen and homemakers, have either been dismissed or arrested for using ByLock since the failed coup attempt on July 15, 2016.

The Supreme Court of Appeals’ Assembly of Criminal Chambers ruled last month that the ByLock smart phone application is to be considered evidence of membership in a terrorist organization following Turkish Justice Minister Abdülhamit Gül’s remarks on ByLock constituting strong evidence of terrorist organization membership.