33 year old son of a Calgary Police Service officer is suspect, he is in custody. 

Police investigator at the scene of a multiple fatal stabbing in northwest Calgary, Alberta on Tuesday, April 15, 2014. Police say five people are dead after a stabbing at a house party. THE CANADIAN PRESS/Larry MacDougal

Calgary: Matthew de Grood, 22, has been charged with five counts of first-degree murder after a stabbing attack at a house party celebrating the last day of university classes. At approximately 1:20 a.m. on Tuesday police were called to the 100 block of Butler Crescent N.W., for reports of several people injured while attending a house party. There were several people at the house party, a number being university students, who were celebrating the end of the school year. The suspect was an invited guest, but when he arrived at the party he obtained a large knife and attacked the victims, one-by-one, stabbing them several times.
When officers arrived they confirmed three people dead in the house, while two others were taken to hospital. The two people who were transported succumbed to their injuries in hospital. In total, five people are deceased – four men and one woman. Multiple witnesses were transported to the Westwinds Campus and are currently being interviewed by detectives. The alleged offender was arrested nearby and remains in custody. No further suspects are being sought at this time.
Chief Hanson held a press conference later in the day with updates on this tragic event.
“Our hearts go out to the family and friends of all of those that have been affected by this extremely tragic event” he said. The victims are described as:
• A 22 year old man from Priddis
• A 23 year old woman from Calgary
• A 23 year old man from Calgary
• A 23 year old man from Calgary
• A 27 year old man from Calgary