PATERSON, New Jersey --WARNING: Some viewers may find the video in the player above disturbing.
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.
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.