CHESTER, Pa. (AP) — A 2-year-old boy was handling a gun in a parked vehicle at a gas station pump near Philadelphia when it discharged, killing a 4-year-old girl, police said.

Chester police said the shooting happened shortly before 11 a.m. Tuesday at the Eagle Save Mart.

Police said adults at the scene rushed the girl to a hospital, where she was pronounced dead.

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Chester police are investigating the case, which they called a juvenile homicide.

Delaware County District Attorney Jack Stollsteimer said he and everyone else in the city and county were “just heartbroken to think of what happened to this poor child.”