Twenty-seven police officers, on early Wednesday, were detained as part of an investigation into the Gülen movement, which the government accuses of organizing a coup attempt on July 15.

Operations, based in Adana, were carried out to round up 27 police officers in eight provinces

The detainees include three police chiefs and were accused of having used a smart phone application known as ByLock, according to Turkish media.

Turkish authorities believe ByLock is a communication tool between members of the Gülen movement. 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.