Four Gülenist suspects, including Hidayet Karaca and former police chief Tufan Ergüder, have been arrested as part of the Tahşiye operation undertaken on December 14. But eight Gülenist suspects including Ekrem Dumanlı -- the editor-in-chief of the Zaman daily -- have been released.

The Turkish court banned Dumanlı from travelling abroad.

Three of the four detained suspects are police officers related to the case. Hidayet Karaca, the president of Samanyolu Broadcasting , was detained because he refused to give testimony to the prosecutor. He was the only suspect who refused to give testimony.

The Gülenist suspects are being charged on the grounds of "establishing and managing an armed terror organization" in Turkey.

The Turkish court has also issued an arrest warrant for Gülen Movement's leader Fethullah Gülen.

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