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    Expert: ISIS may have trained Istanbul gunman

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Expert: ISIS may have trained Istanbul gunman

As the manhunt continues after a New Year's Eve attack at an Istanbul nightclub that left 39 dead, one expert suggests that the suspect may have been trained by ISIS. CNN's Brian Todd reports.

Expert: ISIS may have trained Istanbul gunman

As the manhunt continues after a New Year's Eve attack at an Istanbul nightclub that left 39 dead, one expert suggests that the suspect may have been trained by ISIS. CNN's Brian Todd reports.