Very uncharacteristic behavior of Canadians who are otherwise a reasonable people, which is why it's not hard to believe what media reports say is the responsibility of a particular group of anarchists. However, riots occurred in 1994 after Vancouver lost the 4th game (I think) in the S.C. series, so it could be attributed to a bunch of disgruntled drunken Canucks.
Anyway, big parade in Boston today.