CHICAGO (STMW) — A pit bull that had already attacked one person in the Englewood neighborhood Wednesday morning was shot dead by a Chicago Police sergeant as it attacked a 16-year-old boy on his way to school.

The first incident involving the dog occurred just before 8 a.m. in the 5900 block of South Eggleston Avenue, when the dog attacked a man, biting him in the legs, police News Affairs Officer John Mirabelli said.

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A beat car responded and did not find the dog, but a sergeant on patrol in the area looking for the pit bull was flagged down by neighbors who said the dog was now in the 5900 block of South Stewart Avenue, about a block away from the attack on the man.

A 16-year-old boy had just gotten off a bus and was headed to school when the pit bull saw him, and lunged after him, Mirabelli said.

The dog was biting the boy on the legs and feet, and the sergeant got out of his squad car and began shouting at the dog in an attempt to divert his attention, but the dog continued to attack the boy, Mirabelli said.

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As soon as the dog was a safe distance from the boy so the sergeant could get a clear shot, he fired at the dog, fatally wounding it.

The boy was taken to Saint Bernard Hospital with bite wounds to his feet and legs, police said. The victim of the first attack was taken to Advocate Christ Medical Center in Oak Lawn with injuries to his legs, Mirabelli said.

Police are now trying to find the owner of the dog.

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(Source: Sun-Times Media Wire © Chicago Sun-Times 2013. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)