An Istanbul psychologist, identified as E.E., was sentenced to 10 years and 6 months in prison on accusation of membership to a terrorist organization on Thursday.

The reason for the conviction, Istanbul 29. Heavy Penal Court said, E.E.’s alleged use of ByLock, a controversial mobile app that Turkish authorities claim to be the top communication tool among Gülen movement supporters.

E.E. worked as a psychologist at Istanbul University’s Medical Faculty until he was arrested.

Turkish government accuses Gülen movement of leading the July 15, 2016 coup attempt and considers the group a terrorist organization although the latter denies involvement.

Tens of thousands of people including Taner Kılıc, the chairman of Amnesty International in Turkey have been imprisoned over ByLock use so far.

Spent some time under pre-trial arrest, E.E. was given 10.5 years of jail sentence on Thursday.