A stranger told a 12-year-old girl “I’m going to violate you,” and raped her in a heinous attack in the stairwell of a Brooklyn public housing building Thursday, cops and sources said.

The predator approached the preteen around 5:45 p.m. in the stairwell of the Cooper Houses building on Morgan Avenue near Jackson Street in Williamsburg, according to authorities and sources.

He ordered her to bend over as made his disturbing intentions clear, the sources said.

A suspect raped a 12-year-old girl in the stairwell of the Cooper Houses building in Williamsburg.

NYPD officers work at the NYCHA building where a 12-year-old girl was raped. Kyle Mazza/Shutterstock

He then raped the girl, only fleeing when another person appeared in the stairwell, according to the sources.

The young victim wa

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