NEW YORK (CBSNewYork) — Police on Friday were trying to identify a woman they believe attacked someone with a rubber mallet in an Upper East Side subway station this week.

Around 9:35 p.m. Tuesday, the victim, a 21-year-old woman, was standing in the 96th Street No. 6 train station when she was attacked by an unidentified woman with a black rubber mallet, police said.

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The victim suffered injuries to her head, police said. She was taken to Metropolitan Hospital Center for treatment, police said.

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The suspect was described as a black female in her 20s, standing 5 feet 8 inches tall and weighing 135 pounds, with a slim build.

Police released a photo that is believed to be of the assailant.

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Anyone with information was asked to call the NYPD Crime Stoppers at (800) 577-TIPS or (888) 577-PISTA for Spanish, log onto the Crime Stoppers website, or text tips to 274637 (CRIMES) and enter TIP577.