TULSA, Oklahoma - Tulsa Police are looking for three men who attempted to rob a McDonald's at 13th and Harvard early Saturday morning.

Officers tell News On 6 the manager saw three men, possibly carrying a shotgun, come to one of the doors at about 3 a.m.

The manager called 911 and gathered all the employees into the restaurant's walk-in freezer. Police say the trio broke the glass of an exterior door, but couldn't open an interior door.

The three men then got into a white van with wood paneling and drove away.

Tulsa Police arrived and surrounded the McDonald's. Officers then entered the restaurant and freed the employees.

None of the employees were injured.