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A 9-year-old boy shot and critically wounded a 13-year-old boy on the city’s South Side Friday afternoon, police said.

The 9-year-old was inside a residence on the 5200 block of South Wells Street in the Fuller Park neighborhood with a firearm when he fired one shot and struck the 13-year-old just after 4 p.m., according to Chicago police.

The 13-year-old was transported to UChicago Medicine in critical condition with a gunshot wound to his shoulder, police said.

One handgun was recovered on scene.

Area detectives were investigating.

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