A woman was brutally raped today in Crown Heights, police said.

The victim was outside on Bergen Street near Albany Avenue at 2 a.m. waiting for a cab when the sicko threatened her with a box cutter, cops said.

He then forced the victim up to the roof of the building where he allegedly attacked and raped the woman. The sexual predator then fled the scene.

The victim was treated for her injuries at Kings County Hospital, said a spokesman for the FDNY.