NEW YORK (CBSNewYork) — Police were searching Tuesday night for a suspect who allegedly groped a 16-year-old girl in the Bronx.

Around 8:50 p.m. Sunday, Nov. 1, the girl was walking with her mother up the stairs to an apartment in a building near Frisby Avenue and Overing Street in the Westchester Square section of the Bronx, police said.

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The suspect approached the girl from behind and grabbed her buttocks, police said.

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The suspect then ran off, police said. He was last seen wearing a grey hooded sweatshirt, dark jeans and glasses.

Police have released surveillance photos and video of a man identified as the suspect, in which he appears to pull up the zipper on his jeans as he runs down the stairs.

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