Calgary police say the son of one of their own is a suspect in the worst mass murder in the city's history.
Five young university students were celebrating the last day of classes at the University of Calgary when they were stabbed to death early today.
The suspect -- 22-year-old Matthew Douglas de Grood -- was tracked down by a police dog and later charged with five counts of first-degree murder.
Two of the dead have been identified by friends as Zackariah Rathwell and Josh Hunter, both members of a band called Zackariah and the Prophets.
Media reports in Calgary identify the others as Jordan Segura, Lawrence Hong and Kaiti Perras.
Police say the identities of the dead won't be officially released until autopsies are done and say that won't happen until late Wednesday.
Police Chief Rick Hanson says the suspect's father, a 33-year veteran with the force, and his wife are ``absolutely devastated.''
Investigators are still trying to determine what motivated the attack.
Hanson says the victims were all ``good kids'' in their 20`s and that none of them had any prior involvement with police.