( CNN ) -- Five University of Calgary students were stabbed to death Tuesday morning in what the city 's police chief called `` the worst mass murder in Calgary 's history . '' Chief Rick Hanson said about 30 students were at a house party celebrating the end of the school year Monday night when police received a call at 1:20 a.m. Tuesday for a stabbing . Arriving officers discovered three men dead . A woman and another man who were found injured with stab wounds later died at the hospital , according to Hanson . `` The scene was horrific '' he said . Matthew de Grood , a fellow university student , was charged with five counts of first-degree murder Tuesday afternoon . Hanson said de Grood `` obtained a large knife '' at the house and began attacking his victims shortly after he arrived . `` He targeted the victims one by one , stabbing them several times '' said Hanson . There was no known altercation between de Grood -- who was an invited guest -- and any of his victims leading up to the attack , Hanson said . He does not know why they were targeted . The victims , who have not been named , ranged in age from 22 to 27 . `` These were all good kids '' said Hanson . `` They did nothing wrong . '' De Grood , 22 , is the son of a longtime Calgary police officer . `` ( The suspect 's parents ) are absolutely devastated '' said Hanson . `` They feel so much pain for the families impacted by their son . They are heartbroken . '' Hanson said the suspect had had no previous run-ins with police . `` This is a very shocking and tragic day for our students and our entire university family , '' said university President Elizabeth Cannon . `` Our thoughts and condolences go out to the families of those who have lost their loved ones in this unimaginable and senseless tragedy . '' A Calgary police statement says the identities of the victims will be released pending the completion of the autopsies , which is expected Wednesday . After school stabbing , community asks `` why ? '' Teen charged with murder in high school stabbings .
University of Calgary student accused of killing 5 schoolmates at party . Matthew Van Grood , son of a police officer , is charged with first - degree murder . The murders are ` ` the worst mass murder in Calgary 's history , '' police chief said .