In a circular signed by the party's deputy leader Hayati Yazici, he ordered an "urgent clean-up in the party organisation" to eliminate those linked with the Fethullah Terrorist Organisation - a name Ankara gives for the movement blamed for the July 15 failed putsch, Anadolu news agency reported.
The party decree also said the operation should take place "without giving any room for trouble or gossip within the party."
Turkey has accused Gulen of running a "parallel state" and staging the coup attempt through its supporters in the army -- which the reclusive cleric vehemently denies.
Turkish authorities have implemented a relentless crackdown in the wake of the coup.
Over 60,000 people within military, judiciary, civil service and education have been dismissed, detained or are currently under investigation for suspected links to the Gulen movement.
The crackdown that has also targeted journalists accused of links to Gulen has set off alarm bells in the international arena.
Mumtazer Turkone, former columnist of the newspaper, was one of the journalists arrested by an Istanbul court, it added.
Turkone was remanded in custody on charges of "serving FETO's purposes", nine other suspects on charges of "membership in an armed organisation" and the remaining two on charges of "aiding the organisation despite not being a member of it," Anadolu added.
Turkey issued arrest warrants last month for 47 former staff of the Zaman newspaper suspected of links to Gulenists in the aftermath of the coup.
Turkey yesterday issued an arrest warrant for Gulen on charges of ordering the coup attempt.
But the Turkish cleric, who has been in self-imposed exile in the US since 1999, has denounced the arrest warrant as meaningless, saying that it was typical of a justice system which was not independent.
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