Several young people clutched each other and sobbed as they realized they had probably lost a friend after three bodies were found in a residence on Tuesday in Trois-Rivieres, Que.
Police were called to the scene and said they arrested two minors just as the youngsters were leaving the home.
They later said the victims were two young women and a young man. Their ages were not made public.
Police identified the suspects as 17-year-old boys.