"Worst murder - mass murder - in Calgary's history" committed with a knife

Of course, mass stabbings aren't just limited to China and the US.  Here is a case were five people were killed in Canada, none wounded.   From CBS News:

A University of Calgary student was charged in the fatal stabbing of five people at a house party Tuesday that the police chief called the worst mass slaying in the western Canadian city's history. 

Matthew Douglas de Grood, the son of a 33-year veteran of the Calgary police force, picked up a large knife shortly after arriving at the party and stabbed the victims one by one, said police Chief Rick Hanson.  

De Grood, 22, was charged with five counts of murder late Tuesday. 

"This is the worst murder - mass murder - in Calgary's history," Hanson said at a news conference Tuesday. "We have never seen five people killed by an individual at one scene. The scene was horrific." . . .