Turkish police have detained 20 people in a Konya-based probe on accusations that they use a smart phone application known as ByLock, the Cumhuriyet daily reported on Thursday.

According to the report, arrest warrants were issued for 38 people in seven provinces as part of an investigation into the Gülen movement, accused by the Turkish government of mounting a coup attempt last summer.

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.

This article originally appeared in Turkish Minute on Aug 17.