Turkish police have detained 23 people in a Corum-based probe on accusations that they use a smart phone application known as ByLock, on Aug 28.

According to state-run Anadolu agency, arrest warrants were issued for 33 people in eight provinces as part of an investigation into the Gülen movement, accused by the Turkish government of leading a coup attempt last summer. The suspected 33 people included those who were earlier dismissed from their jobs over ties to the movement.

Turkish authorities believe using ByLock is a sign of being a Gülen movement member as they see the mobile phone application as the top communication tool among the group.

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

Turkey’s Justice Ministry announced on July 13 that 50,510 people have been arrested and 169,013 have been the subject of legal proceedings on coup charges since the failed coup.

Turkey has suspended or dismissed more than 150,000 judges, teachers, police and civil servants since July 15.