An Istanbul court arrested the chief executive of the Turkish daily Cumhuriyet, Akın Atalay, on Saturday for supporting PKK and FETÖ terrorist groups.

Atalay is accused of "conducting activities on behalf of terrorist organization without being a member". On Friday, Istanbul police detained Atalay at Istanbul Atatürk Airport after arriving from Berlin.

On Monday, a statement by the Istanbul Chief Public Prosecutor's Office said that an investigation was launched into the executives of Cumhuriyet on Aug. 18 for committing crimes on behalf of the FETÖ and PKK terror groups.

The statement added that irregularities in the board member election to the Cumhuriyet Foundation on April 2, 2013 and articles legitimizing a coup attempt prior to FETÖ's July 15 coup attempt were among the charges.