Police in New Jersey are investigating an apparent attack after a video was posted on social media.
The video appeared on Facebook this week and shows someone throwing a punch, appearing to knock out an unsuspecting victim.
The person shooting the video can be heard encouraging the attacker. Paterson police called the video disturbing and thanked residents who reported it.
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Police Director Jerry Speziale released a video statement Friday on Facebook to the public about the video.
So far, there's no word on any arrests or the victim's condition.