NEW YORK (CBSNewYork) – Police are looking for a man they say attempted to rape a woman in her apartment building’s laundry room in Brooklyn.

According to authorities, the suspect entered a residential building on Lincoln Road and Flatbush Avenue around 7:30 a.m. on Friday.

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Investigators say a 30-year-old woman was doing her laundry when the suspect approached her with his pants already down and exposing himself. The man allegedly demanded his victim perform a sex act on him, but she refused.

That’s when police say the suspect claimed he had a knife and sexually assaulted the 30-year-old and attempted to rape her.

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The victim was able to break free and find a neighbor in the building who called 911.

Sketch of a rape suspect reported in Brooklyn on March 1, 2019. (Credit: NYPD)

Police released a sketch of the attacker who they say is a black man in his 20’s, standing about 6-foot-4 with a muscular build. He was last seen wearing a black hat, sweatshirt, and sweatpants.

Officers added that the knife the suspect claimed to have was never seen and was not recovered at the crime scene.

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Anyone with information about the attack is asked to call NYPD’s Crime Stoppers hotline at 1-800-577-TIPS (8477) or 1-888-57-PISTA (74782) for Spanish. You can also submit a tip via the Crime Stoppers website, by Tweeting @NYPDTips or by texting a tip to 274637 (CRIMES) and then entering TIP577.