Meanwhile, police formally identified the dead as Michael Bleakney, 57; Connor Boyd, 21; Karen Krzyzewski, 53; Kyle Nash, 21; and Rob More, 35. Bus driver Dave Woodard, 45, was also killed in the crash.
"Our thoughts are with the victims, their friends and families," the police news release said.
Five of the victims were pronounced dead at the scene; one died later in hospital.
Boyd and Nash were students at Carleton University. Roseann O'Reilly Runte, the university's president and vice-chancellor, offered condolences.