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A Michigan Walmart saw back to school violence. Justin Sullivan/GETTY

In a Michigan Walmart, an argument over back to school shopping reportedly caused one woman to pull a gun on another shopper. Four women in the back to school section got into an altercation over school supplies Tuesday at the store in Novi, Michigan.

“It was in the back to school section over a notebook,” Novi Police Det. Scott Baetens told local Fox-affiliate WJBK. “One girl was going to buy a notebook. There was one left, some pushing resulted. They began to argue who was the rightful purchaser of that notebook.”

The incident involved two women — ages 46 and 32, respectively — from Farmington Hills, Michigan, and a mother and daughter from South Lyon, Michigan, who were 51 and 20.

Both women reached for a notebook, at which point things got heated. Neither duo would back down. The two Farmington Hills women began to pull the 20-year-old's hair while her mother was pushed aside, according to the Detroit Free Press Wednesday.

At that point, the young woman's mother pulled the gun. The woman, according to police, was licensed to carry.

“She pulled out her firearm and tells them to stop attacking her daughter while pointing the gun at them,” Baetens told WJBK.

The names of women have not been released, nor has the type of gun. According to police, the gun was loaded, but the chamber was empty. No one was hurt in the incident, but all four women could face charges.

Authorities are investigating the scuffle, looking at security footage and hoping more eyewitnesses come forward.

“A simple assault could be just a local ordinance, a 90-day misdemeanor,” Baetens told WJBK. “All the way up to felonious assault with a firearm, which is a felony.”