CHICAGO (CBS) — Police hope a new sketch will help them find a suspect who attacked the same teenage girl twice in the Rogers Park neighborhood.

Both of the attacks occurred near Howard Street and Ridge Boulevard this week.

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Police say the girl, 15, was walking to a bus stop around 5 p.m. on Halloween Monday, when the man raced up from behind on a bicycle, grabbed the girl and brought her to an alley where he fondled her.

On Wednesday about 8 a.m. near the same area, the man again encountered the girl. He chased her but she was able to get away and police were called.

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The suspect is black, 20 to 25 years old, standing about 5 feet 8 inches tall and weighing 190 pounds, with a dark complexion and facial stubble. He was last seen wearing a solid black hooded sweatshirt, red checkered shirt, blue jeans and black/red/white/gray gym shoes. He was riding a blue mountain bike, a police community alert said.

A sketch of the suspect has been released.

Anyone with information should call detectives at (312) 744-8261.

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The Sun-Times Media Wire contributed to this report.