According to the Memphis Police Department, officers were called to the fast-food restaurant Tuesday for reports of shots fired.
Police say a woman got angry about the wait time in the drive-thru and walked up to the service window. A fight ensued between the customer and workers.
The woman reportedly returned to her vehicle to retrieve a gun before extending her upper body through the drive-thru window and firing several shots at the employees. She then fled the scene in a grey sedan.
Police say no workers were harmed in the shooting.
No arrests have been made and the incident remains under investigation.