At least 15 people the central Anatolian province of Kayseri were detained as part of an investigation into the Gülen movement, which the government accuses of masterminding the July 15 coup attempt, on Friday.

Kayseri police carried out operation to round up two employees from the local tax office; one from the Revenue Office; two from the Social Security Institution; two from the Provincial Directorate of Family and Social Policies; the Provincial Directorate of Agriculture and Livestock; one from the Small and Medium Industry Development Organization; one from the 6th Provincial Directorate for Highways; three from Abdullah Gül University; one from the 12th Directorate General for State Hydraulic Works and one from Adana Provincial Gendarmerie Command.

The detainees are accused of having used ByLock mobile application.

Turkish authorities believe ByLock is a communication tool between members of the Gülen movement, which the government accuses of masterminding the July 15 coup attempt.

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