The venue change created major technical problems, including a stage built too low and close to the fans. The Hells Angels were then hired for stage security, which resulted in numerous fights with concertgoers, as well as an on-stage altercation with members of the Jefferson Airplane, in which singer Marty Balin was struck and knocked unconscious. Audience member Meredith Hunter was stabbed and killed when he rushed the stage with a gun while The Rolling Stones were performing. These incidents were captured on film and appear in the Maysles Brothers documentary film "Gimme Shelter". There were also three accidental deaths among the crowd of 300,000.