An arrest warrant has been issued for Oklahoma City center Enes Kanter on charges of membership in an armed terrorist organization, Turkish media reports said on Friday.

İstanbul Public Prosecutor Can Tuncay, who is overseeing the investigation into Kanter, has reportedly issued an arrest warrant for him.

Kanter is accused of using a smart phone application known as ByLock and praising the Gülen group from his social media accounts.

Turkish authorities believe ByLock is the top communication tool among the followers of the Gülen group, which is accused by the Turkish government of masterminding a failed coup attempt on July 15.

The group denies any involvement in the coup attempt.

The prosecutor’s office has also reportedly applied to Turkey’s Justice Ministry to ask Interpol to issue a red notice for Kanter.

Last weekend Kanter’s  passport was seized by Romanian police at Henri Coanda Airport upon a request from the Turkish government. Kanter said in a 45-second video that he had been held at the airport for hours on the grounds that his passport had been canceled by the Turkish government due to his “political views.” Kanter was later able to retrieve his passport and fly to the US.

Twenty-five-year-old Kanter is one of the most famous Turkish basketball players in the NBA. His family disowned him after he pledged support to Islamic scholar Fethullah Gülen, who inspired the Gülen group.