A Gwinnett County police officer is OK after being shot at during a Sunday night traffic stop, a department spokesman said.

The incident happened about 10:20 p.m. Sunday after an officer patrolling in the area of Dawson Boulevard and Graves Road “observed a dark-colored sedan traveling at a high rate of speed,” Gwinnett police Sgt. Troy Tobler said in a statement.

The officer caught up with the vehicle, activated his blue lights and initiated a traffic stop for the excessive speed, Tobler said.

“An occupant of the vehicle fired what the officer believed to be shots before three to five more shots were fired and the officer saw muzzle flashes to match the popping sounds,” he said.

The driver of the vehicle refused to pull over and the officer later lost contact with the car. The officer was not injured.

“A few minutes later, a different officer made contact with a possible suspect vehicle on Graves Road,” Tobler said. “The driver of that vehicle was arrested on traffic charges, but it is still unclear if the vehicle was involved in the earlier shooting.”

Police later found shell casings in the area of the original attempted traffic stop.