DALLAS (CBSDFW.COM) – An 11-year-old boy has died after he was shot by a child who found a handgun while inside a vehicle in a Walmart parking lot in Dallas Sunday afternoon, police said.

Police said they responded to the shooting at around 12:40 p.m. at the location in the 2800 block of South Buckner Boulevard.

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The 11-year-old was transported to a hospital, where he died. His identity has not yet been released.

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Police said a 32-year-old woman left the victim and a 9-year-old boy alone inside her vehicle while she went inside the store prior to the shooting. Investigators believe the 9-year-old found the handgun and shot the victim.

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Further details have not yet been released as police continue to investigate.