The Mt. Vernon Police Department is investigating an early Sunday morning attempted armed robbery of the Walmart store in Mt. Vernon.

Information indicates police received a call from someone inside the store at 1:54 a.m. Sunday reporting three subjects entered and attempted to rob the store.

The subjects were described as wearing black ski masks and possibly trench coats of various colors.

The three reportedly fled the store through the emergency exit of the dairy department on the south side of the store.

The store was temporarily placed on lockdown. No injuries were reported.

Jefferson County Sheriff’s deputies are assisting the Mt. Vernon Police Department.