Customers and staff scattered after the gun was brandished, as can be seen in video capturing the chaotic scene shared by a bystander.
The woman who pulled out the gun carries a concealed pistol license valid in the state of Michigan, police said. The gun was loaded, but there was no round in the chamber, WJBK reported.
The four women involved in the incident, who range in age from 20 to 51, could face charges, police said. An investigation is ongoing.
It's not clear who got the notebook, authorities said.
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