Jefferson Parish deputies say an unsupervised child started the fire in the Harahan Walmart on Monday night.
Detectives say a woman went to the store about 9 p.m. with a toddler and a girl aged between six and nine.
The girl went to the bathroom alone, and surveillance video reportedly shows her taking a lighter from a display case and starting a fire in the women's clothing section.
The woman and the kids soon left the store.
The sheriff's office is trying to find the woman.
No criminal charges are expected to be filed against the girl.
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