It happened just after four o'clock this morning at 9600 North Rodney Parham Road on the city's west side.
Two women workers were locking up the business when two men armed with handguns forced them back inside.
The woman told police the men were communicating on a two-way radio with a third suspect.
While one of the men tried to get into the safe, the other attacked one of the women, according to the report. Police said she was not seriously hurt.
Two of the suspects are described as black men 20 to 22 years old. They were wearing black masks, black shirts and black pants. One of them was 5'4", 130 pounds and the other was 5'7", 150 pounds, police said.
The suspects were last seen running north away from the restaurant.