San Diego grindcore band Cattle Decapitation was headlining a show at La Habra, CA, venue The 13th Frame on Wednesday night, January 7th, when violence broke out in the moshpit.

It seems that one concertgoer who took exception to being slammed into pulled out a knife and stabbed another fan in the neck. Several other fans then ganged up on the attacker and knocked him unconscious. The show was shutdown before the band could finish their set. See the video below of the band attempting to perform a new song before being informed what has happened and shut down by venue security.