One suspected "terrorist" was shot dead by Turkish police during the gun battle, CNN Turk reported, while at least one accomplice was feared to be on the run.
Gunfire has been reported outside a police station in the Turkish city of Gaziantep in a suspected terror attack.
Local reports said ambulances were sent to the scene, near the Syrian border, amid fears of casualties.
Turkey's NTV broadcaster said the assailants may have been planning a suicide bombing. Disposal teams were being deployed to search for any explosive devices.
There was no immediate claim of responsibility.
