Fatih Gürsul, a former advisor to main opposition Republican People’s Party (CHP) Chairman Kemal Kılıçdaroğlu, has been given 10 years, 6 months prison sentence for “aiding and abetting a terrorist organization.”

Gürsul was earlier arrested by an İstanbul court in December 2016 on charges of using ByLock, a smart phone application that authorities claim is a communication tool between members of the Gülen group.

The group is accused by the Turkish government of masterminding a coup attempt on July 15, 2016.

In addition to Gürsul, tens of thousands of civil servants have either been dismissed or arrested for using the application.