Brutal video shows the moment two masked thugs pinned an off-duty NYPD cop to the ground at knifepoint in the Bronx — and then savagely stomped on his face.
The shocking caught-on-camera assault unfolded on St. Peter’s Ave. in Westchester Square after the two goons zeroed in on the officer just after 4 a.m. on Saturday, police said.
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Surveillance video captured the pair approaching the cop on the sidewalk and immediately throwing him to the ground next to a huge pile of trash…