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Birmingham police are trying to identify a man who robbed Wendy's at 9870 Parkway East on Wednesday, Nov. 2, 2016. The getaway driver is in custody.

(Birmingham Police)

Police are searching for a gunman who robbed a Birmingham Wendy's on Wednesday night.

The holdup happened about 9 p.m. at the fast-food restaurant at 9870 Parkway East. Birmingham police spokesman Lt. Sean Edwards said the suspect entered the store and ordered a Frosty.

After the cashier fixed the shake, the suspect walked behind the counter, brandished a handgun and demanded money. When the cashier didn't give him any money, the suspect calmly walked out of the restaurant and got in a vehicle that was waiting outside.

Edwards said a customer was pulling up to the restaurant, saw the pistol in the suspect's hand and figured out something wasn't right. That customer called 911 and stayed on the line with the dispatcher and followed the suspects until police arrived to try to stop the vehicle.

The suspects refused to pull over and a brief chase followed. The car chase was followed by a foot chase, and police were able to take the driver into custody. The gunman and a third suspect got away.

Anyone with information is asked to call Birmingham robbery Det. Wilder at 205-254-1753 or Crime Stoppers at 205-254-7777.