CALGARY, Alberta (AP) — The son of a Calgary police officer was charged in the fatal stabbing of five people at a house party that the law enforcement officials called the worst mass slaying in the western Canadian city’s history.

Matthew Douglas de Grood, a recent graduate of the University of Calgary, picked up a large knife shortly after arriving at the party and stabbed the victims one by one shortly after 1 a.m. Tuesday, said police Chief Rick Hanson.

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