CCTV camera captures the terrifying moments when a man knocked down two party-goers near a beach in San Diego, California.

The video, shot on July 8, shows the attacker removing his t-shirt and knocking the two men to the ground with vicious punches.

Passer-by can then be seen helping out the two victims before they appear to nearly enter another fight.

At the end of the video, one of the men appears to try and calm his friend down to take him away from the scene.