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A 20-year-old Michigan mother has been charged with assault after police say she punched a grocery store clerk in front of her 1-year-old daughter.

Surveillance video caught the incident unfolding Tuesday at a Kroger store in St. Clair Shores.

Police say Shelby Parham was in the self-checkout area before walking up to a 49-year-old clerk and hitting her in the face.

The woman was knocked flat on the ground, rendered unconscious, and suffered a head injury.