The driver of the bus was arrested at the scene, Chief Charles Bordeleau of the Ottawa police told an evening news conference at city hall.
On Friday, it became the site of a fatal crash by a double-decker OC Transpo bus, which hit a shelter as it was travelling the 269 route on its way to Bridlewood, which is located in the suburb of Kanata, and just under 20 kilometres away from the station. Road closures remain in place near the scene of the collision and police are asking the public to avoid the area.
Four hours after the crash, Ottawa Hospital said that seven patients were in a critical condition and nine in a stable condition. Their names have not been released.
The Ottawa Police Service Collision Investigation Unit arrived to investigate the incident.
The three have not been identified by Ottawa police. "I have asked staff to ensure all necessary resources are made available to assist them through this hard time".
He said the upper deck of the bus was badly damaged in the crash, trapping several people inside for some time.
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Emergency crews were called to Westboro station in Ottawa following a collision involving a double-decker OC Transpo bus. The first seats on the upper level of the bus were crushed together.
OC Transpo has been struggling with a bus driver shortage and chronic service problems as they transition from busses to the new, delayed LRT line.
In 2013, another Ottawa double-decker city bus broke through a warning gate and collided with a Via Rail train in suburban Barrhaven, killing six people as the train sheared off the front of the vehicle.
Bordeleau also said it was too early to speculate about the cause of the crash, but police would be poring over video and interviewing as many witnesses as possible.
Residents looking for information about family members should go to the Churchill Seniors Centre at 345 Richmond Road, Watson said.