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NOVI, Mich. — Video shows workers and shoppers scattering after a woman pulled out a gun during a fight in the school supplies aisle at a Michigan Walmart store.

According to WJBK, the incident started when a couple of women shopping together — ages 32 and 46 — got into an argument with a 20-year-old woman and her 51-year-old mother.

Both groups of women wanted to buy the last notebook on the shelf, and an argument broke out over who reached for it first.

Shoving ensued, and witnesses say two women began pulling the 20-year-old’s hair.

Police told WJBK that the younger woman’s mother then pulled out her gun and ordered the other two women to stop attacking her daughter.

Video shows customers and employees running from the area.

The armed woman is licensed to carry a concealed weapon, according to police, who confirmed the gun was loaded but no round was in the chamber.

No one was hurt in the incident, but Novi police Det. Scott Baetens called it a “senseless act of violence all the way around.”

Prosecutors are still trying to determine if the woman pulled out the gun in self-defense, and if any other women will face charges.

Investigators are trying to get more witnesses to come forward, and they’re trying to get surveillance video from the store to get a closer look at what happened.