A clerk at the Dunkin' Donuts in Fayetteville was robbed early Thursday morning via the drive-through window, police said.

The incident began with an order for coffee through the restaurant's drive-through speakers, around 2:15 a.m. Thursday, said Capt. Steve Crawshaw of the Fayetteville Police Department.

But when the car pulled up to the window, one of three black males pointed a 9mm handgun at the clerk and ordered him to hand over the cash from all register, Crawshaw said.

The suspects were described as being in their early 20s, perhaps their late teens and driving a "big car" which was thought to possibly be a Cadillac, Crawshaw said. The description of the suspects was not very detailed, Crawshaw said.

Anyone with information about the incident is asked to call the police department at 770-461-4441. The incident is being investigated by Fayetteville detectives.