Update to this story.

Via Raw Story:

A man at a protest against police brutality in Berkeley, California, was knocked out with a hammer on Sunday night after he tried to stop looters.

Disturbing footage of the incident was captured on camera by Berkeleyside reporter Emilie Raguso.

The brief video shows a man in a bicycle helmet pushing protesters wearing black hoodies outside a Radio Shack on Shattuck Avenue in Berkeley. One of the protesters then smashes a hammer into the man’s head, and he drops to the ground.