Police on Friday released disturbing surveillance video showing a teen pleasuring himself in front of a 60-year-old woman in an elevator in the Bronx moments before attacking her.

The suspect and the woman entered the elevator on the first floor of an apartment building on Grand Concourse near E. 174th St. in Claremont around 12:30 a.m. Thursday, according to cops.

Once in the elevator, the teen exposed himself and began masturbating, officials said.

The woman exited the elevator on the third floor, where the suspect followed and put her in a headlock, authorities said. Her screams scared off the teen, who fled the building.

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The woman was not injured during the attack.

Cops described the suspect as black, between the ages of 17 and 20, 5-foot-7 and 130 pounds, with a thin build and light complexion. He was last seen wearing a red baseball cap, black sneakers, a gray hooded jacket, black jeans and black glasses.

Anyone with information is asked to call CrimeStoppers at (800) 577-TIPS. All calls will be kept confidential.

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