Police are looking for a suspect they say violently attacked a woman over the weekend during an alleged robbery.

On May 29 at about 2:20 a.m. the suspect — described as a 25-year-old black man — approached the 30-year-old victim from behind near East 18th Street and 1st Avenue, according to authorities.

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The man then placed the woman in a chokehold and dragged her to the floor, police said. When the victim attempted to fight back, the man allegedly punched her in the face numerous times, ultimately knocking her out.

Once the victim regained consciousness, cops said, the suspect was gone and she noticed that her cellphone was missing and her underwear had been lowered to her knees.

Emergency personnel took the victim to Beth Israel Hospital to be treated and evaluated.

Police have released surveillance video of the alleged attacker entering what appears to be a building.

Authorities described the suspect to be between 5 feet 7 inches and 5 feet 10 inches tall, 150 pounds and with a beard.

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He was last seen wearing a black t-shirt, dark colored pants and a yellow metal chain around his neck.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).

The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577.