Police in New Jersey are investigating a video that appears to show an officer punch a woman in the face.

Cell phone video posted on YouTube shows a group of people fighting outside the Envy nightclub in Elizabeth.

At one point, an officer and a few others emerge from the crowd, and it appears the cop reaches back and punches a woman directly in the face.

The circumstances behind the incident were not immediately known. Elizabeth Police said they are investigating, and the officer remains on active duty.

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