Ottawa police said investigators have identified all three victims and have contacted their families and loved ones.
She says their names will not be released at this time.
The bus was at or near its full capacity at the time of the collision, Bordeleau said Saturday. It plowed along a station platform and into the overhanging roof of the transit shelter, which carved deep into the vehicle's upper level and crushed a number of seats.
The Chief also clarified initial information the three victims killed were two passengers on the bus and a pedestrian waiting on the platform, as he said they are now getting conflicting information and will update the public as soon as possible.
The OC Transpo driver was arrested following the horrific crash at the city's busy Westboro Station. Road closures will remain in place, and people are urged to avoid the area.
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"It's just an bad thing for us as a whole community, as a city, to go through", she said. "I know all those impacted by this tragedy will be surrounded and supported by many", Bordeleau wrote in a tweet published late Friday evening. The most seriously injured, there was accordingly, in the upper deck, as Ottawa police chief Charles Bordeleau said.
Police have already spoken with the bus driver who was released unconditionally pending further investigation.
"There were 90 people on the bus, we have to speak to all of them", Bordeleau said at a Saturday afternoon news conference.
Bordeleau made it clear while police expect to release the scene Saturday, work collecting evidence, analyzing photos, videos and data, along with interviewing the almost 90 people on the bus is going to be a "slow, painstaking process".
The Ottawa Paramedic Service said Friday there are multiple critical injuries, though no immediate reports of fatalities.