A ski mask-wearing brute robbed an off-duty NYPD cop at knifepoint in Brooklyn early Thursday, cops and sources said.

The mugger grabbed the victim’s car keys, wallet, and phone before he took off. AntonioDiaz – stock.adobe.com

An off-duty NYPD cop was robbed at knifepoint at Metropolitan Avenue and Leonard Street in Williamsburg on Thursday at approximately 2:20 a.m. Rush – stock.adobe.com

The mugger — also seen wearing all black — stormed up to the 31-year-old victim around 2:20 a.m. at Metropolitan Avenue and Leonard Street in Williamsburg while displaying a knife , police said.

He grabbed the victim’s car keys, wallet and phone on the mixed residential and commercial block before taking off, cops said.

He had not been arrested hours later.

The victim, who sources described

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