ATTACK: Matthew Douglas de Grood has been arrested after allegedly stabbing and killing five people at a house party in Canada [FACEBOOK/AP]Matthew Douglas de Grood, the son of a veteran police officer, has been charged with five counts of murder following the killings in Calgary.Police Chief Rick Hanson said: "We have never seen five people killed at one scene. The scene was horrific."At least 20 people were at the house party which was being held to celebrate the end of term at the University of Calgary.De Grood, 22, was invited to the party and soon after arriving picked up...
