Heavy metal rock fans went on a rampage in Montreal after a sold-out concert by Guns N' Roses and Metallica was cut short. Metallica ended its portion of the concert early after lead singer James Hetfield suffered second-degree burns when a stage prop exploded. Then Guns N' Roses shortened its appearance after singer Axl Rose developed a voice problem. Witnesses in the crowd of 53,000 said the riot erupted as concert-goers left the Olympic Stadium. About 2,000 began throwing things at police, overturning cars and smashing windows. Police said at least three police officers and 10 rioters received minor injuries, and at least 12 people were arrested.