I heard about this on the news this morning and figured it was just a certain horrible Canadian singers* fans gone rabid.....

From CNN: Montreal police said the violence started shortly after 8 p.m. Tuesday when show organizers told hundreds waiting outside Medley Hall that the bands Total Chaos and The Exploited would not be performing.

"At that point the crowd turned crazy and turned into a riot," Yannick Ouimet, a Montreal police spokesman, told Global Television.

French-language TV channel LCN said Canadian customs officials had barred some members of The Exploited from entering the country.

One witness said the rioters shouted "Let's start a war! We want to riot."

One city block had 24 cars with smashed windows and at least six stores had their windows smashed, Canadian Press reported. Firefighters put out fires in at least four cars that were overturned and set on ablaze.

An unknown number of people were arrested after riot police arrived, Canadian Press said.

Two police officers sustained minor injuries.

*Name has been removed to protect our sanity