A woman was indecently assaulted while biking on Memorial Drive in Cambridge Wednesday night, State Police said.

The woman, 23, called police at 7:35 p.m. to report she was riding eastbound on Memorial Drive when a man on a bicycle came up and grabbed her buttocks from behind and then fled on his bike over the Boston University Bridge.

Troopers searched the area but could not find the man, State Police spokesman David Procopio said.

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Police interviewed the woman at the Boston barracks and then drove her home.

The suspect is described as a black male who was wearing a black, water-resistant-type jacket, oversized gray sweatpants, a white bike helmet and sneakers, Procopio said in a statement.

Anyone with information is asked to call the Boston barracks at 617-727-6780.

Procopio said it’s unclear whether the indecent assault is connected to any past assaults along the Esplanade.