The stabbings happened around 1:20 a.m. MT on Tuesday at an address in the 100 block of Butler Crescent N.W., police said.
According to neighbours, the youths had been celebrating the last day of university classes with a fire in a home's backyard.
Bermuda Shorts Day festivities to mark the end of the University of Calgary’s winter semester have been a campus tradition since 1960.
Three people were pronounced dead at the scene while two others were taken to hospital in critical, life-threatening condition, and later died, officials said.Four of those who died were male and one was female, officials said.
Calgary stabbings: 4 male youths, 1 female dead - Calgary - CBC News