Ömer Çatkıç, a former Turkish national football team goalkeeper was arrested on Monday on as part of an investigation into the Gülen group, which is accused by the Turkish government of masterminding a failed coup attempt on July 15, 2016.

Detained on Aug 22, Çatkıç is accused of being a member of the Gulen movement. Among the evidences for his arrest were his alleged use of the controversial smart phone application known as ByLock and his alleged money deposit into Bank Asya, according to Turkish media.

Turkish authorities believe using ByLock is a sign of being a Gülen follower 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.

Money deposits into Bank Asya, an Islamic lender established by Gulen followers and shuttered by the government, are also seen as an evidence of membership to the Gulen group especially when funds were deposited after late 2013, the time when AK Party and the movement showed early signs of falling apart.

The military coup attempt on July 15, 2016 killed 249 people and wounded more than a thousand others. Immediately after the putsch, the Justice and Development Party (AK Party) government along with President Recep Tayyip Erdoğan pinned the blame on the Gülen movement and initiated a widespread purge aimed at cleansing sympathizers of the movement from within state institutions, dehumanizing its popular figures and putting them in custody.

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.