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An Istanbul court has charged Tuncay Uzundal with belonging to an armed gang, the agency said, adding another man was released without charge.
No more details were immediately available but the other seven men charged, including self-confessed gunman Ogun Samast, are all from the Black Sea province of Trabzon.
Police are still questioning three more people in the case.
Turkish newspapers say police were warned a year ago about a plot to kill Dink but failed to act to prevent the killing.
Interior Ministry inspectors began probing the Istanbul police handling of the case on Thursday, media said.
Inspectors have already examined the Trabzon police handling of the case and were also questioning officials in the Black Sea town of Samsun, where the murder suspect Ogun Samast was caught. Reuters