CHICAGO (STMW) — Police are searching for a man who tried to kidnap a 12-year-old girl Friday at a South Side Red Line station, but was thwarted when a passer-by intervened.

The girl was waiting for a bus at the 79th Street Red Line station when the man called to her from his vehicle about 8:45 a.m. Friday, according to a community alert issued by Area South detectives.

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She ignored him, but the man got out of his vehicle, grabbed her arm and tried to pull her into the vehicle, the alert said. He fled eastbound on 79th Street when a woman came to the girl’s aid.

The girl got on the bus with the woman’s help and later reported the incident to her mother, the alert said.

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Police describe the would-be abductor as a black man between 20 and 29 years old, with a dark complexion and short hair, the alert said. He was wearing a black shirt, blue jeans and white shoes.

He was driving a black, newer-model vehicle with sliding side doors that police describe as a “caravan,” the alert said.

Anyone with information about the incident is asked to call Area South detectives at (312) 747-8271.

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(Source: Sun-Times Media Wire © Chicago Sun-Times 2012. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)