WATCH: Ottawa police say investigation underway into bus crash that killed 3, make appeal for witnesses

Members of Canada’s defence team were injured in the bus crash in downtown Ottawa on Friday that left three dead and 23 injured, while a local hospital says those who were in critical condition at its location have improved.

3 dead, 23 injured in bus crash at Ottawa transit station: city officials

Minister of National Defence Harjit Sajjan announced on Twitter that members of the Defence Department were among the injured on Sunday afternoon.

“I’m aware that members of our Defence Team sustained injuries and will be monitoring the situation,” he said. “Thank you to the many first responders for their continued efforts.”

The crash involving an OC Transpo vehicle happened Friday around 3:50 p.m. at the Westboro transit station west of downtown Ottawa when the double-decker bus hit the overhang of the shelter, tearing apart the top right section of the vehicle.

WATCH: Bus involved in fatal Ottawa crash removed from scene

The bus driver was arrested soon after the crash and questioned but has since been released.

Paramedics said Friday evening that 25 people were taken to hospital from the scene, 14 in critical condition and 11 in serious condition.

‘Long and detailed’ investigation underway into Ottawa bus crash that killed 3

The Ottawa Hospital said Sunday that seven patients in serious condition and four patients in stable condition remained in its care. Patients previously in critical condition were moved to serious condition, the hospital said Sunday.

The identity of the three victims of the collision at Westboro station have not been released.

Ottawa police said Saturday an investigation is underway, but it will be “long and detailed and complex.”

“We are reviewing all aspects of the collision including the vehicle, the roadway, the weather and the driver’s actions,” Sgt. Cameron Graham of the Ottawa police collision investigation unit said.

WATCH: Police promise long, detailed investigation into Ottawa bus crash

Ahmed Shalaby, a civil engineering professor at the University of Manitoba, has called on the federal Transportation Safety Board to investigate the crash to prevent more from happening.

The safety board says it is not investigating the collision as the agency only looks at marine, pipeline, rail and air incidents.

On Sunday at 7:30 p.m., the City of Ottawa reopened the Transitway, a roadway for buses operated by OC Transpo, which had been closed between Dominion and Tunney’s Pasture stations since Friday evening. The Westboro transit station is located between Dominion and Tunney’s Pasture.

Transportation Safety Board should investigate Ottawa bus crash, experts say

The city also said that the public can leave a memento or memorial item for the victims of the collision at two designated areas around the Westboro station: the lower level of the Westbound Transitway platform or the northwest corner of Scott Street and Athlone Avenue.

There will also be a book of condolences at City Hall beginning at noon on Monday, Jan. 14 and will remain there until the end of Jan. 20.

– With files from the Canadian Press

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