CHICAGO (CBS) — Police were warning Northwest Side residents about a man suspected of raping several women at knifepoint.

According to an alert from Grand-Central Area Detectives, the man attacked a 31-year-old woman at about 1 a.m. Sunday as she was walking on North Avenue between Pulaski Road and Homan Avenue. Police said the man was driving a small, blue, four-door vehicle when he approached the woman and took her into an alley on the 1400 block of North Monticello Avenue and raped her at knifepoint.

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Police said the man is suspected of raping other women who have “high-risk lifestlyes,” but did not release any details from the other attacks.

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The attacks have occurred in the Grand-Central and Shakespeare police districts, which include the Humboldt Park and Logan Square neighborhoods.

The suspect is described as a Hispanic man, approximately 35 years old, who is between 5-foot-7 and 5-foot-8, with a stocky build and a medium complexion. The man wears his hair in a long mohawk with a ponytail in the back and the sides of his hairline are shaved, police said. He also has a tattoo of a cross on his right shoulder.

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Anyone with information about the suspect should call Grand-Central Area detectives at (312) 746-8282.