The Gaziantep governor's office said late yesterday that the group may also have been planning attacks on the offices of a newspaper in Istanbul and Ankara.
It was not clear when the arrests were made but the governor's office said the group planned to create "fear and chaos" prior to the election that took place Sunday.
Two of the suspects were detained after they hurled hand grenades at police during a car chase. The seven others were detained in police raids, it said.