Andrew Borle was waiting for a bus on the other side of Westboro Station when the crash took place.
Two of the three people killed in the crash were on the bus, while the other was standing on the platform at the time of the collision. Twenty-three people were hurt and taken to hospitals, he said.
The vehicle apparently jumped the curb as it approached the station and plowed along the platform, where the roof of a shelter carved deep into the vehicle's second deck.
"We are receiving many calls and we ask for your patience as we try and help you retrieve your belongings", police tweeted.
"That was based on initial information", Bordeleau said at Saturday's press conference.
Rivett-Carnac said that the first responders seemed "cool, calm and collected" as they worked "quite systematically to gain access to the passengers on the top (of) the bus".
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Myles Cassidy, the chief of the Ottawa paramedic service, said that a total of 25 patients had been transported to the hospital from the scene.
He says they will also have to survey the wreckage using drones, go over video and data gathered from the bus and bystanders.
"Where I was (at the back of the bus), there was blood pooling underneath the seats just in front of me", he told CTV Ottawa, describing the immediate aftermath of the crash. This particular bus was not scheduled to stop at the Westboro station, which is another aspect being probed in the investigation. I felt like vomiting a couple of times.
Canadian Prime Minister Justin Trudeau expressed his condolences on Twitter.
"My first thoughts are with those who have been injured and their families". The investigation into that case found the cause was a combination of excessive speed, a hard curve before the tracks and driver distraction.
- With files from David Reevely in Ottawa and Laura Kane in Vancouver.