The crash took place at 3:50 p.m., during Friday rush hour, at Westboro station in an urban neighbourhood.
Graham said police will be flying drones today to take aerial shots and they hope to clear the scene, and the accompanying roadblocks, by the end of the day.
Ottawa Emergency Services transported the injured from Westboro Station to a local hospital.
"The bus started swerving, I guess it hit the curb or hit something".
His partner usually gets off the bus at that station when coming home from work but she hadn't gone in on Friday, he said, and they were checking in with family and friends who live in the area to see if they're OK. Bordeleau said new information has surfaced to challenge that account, but did not provide further details. The bus was westbound for Kanata, a more distant Ottawa suburb, Watson said.
"Please keep victims, witnesses, families and our wonderful first responders in your thoughts".
Ottawa Police Chief Charles Bordeleau said several people on the top section of the bus had to be freed.
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"Our thoughts are also with the others on that bus, at that station - those directly involved and those who witnessed the collision".
Injured passengers were being treated by paramedics on the ground surrounding the bus.
"There's no question that the weather adds complexity at the scene", said Bordeleau.
Politicians, including Prime Minister Justin Trudeau and Ontario Premier Doug Ford, tweeted messages of support.
Watson publicly thanked the many politicians at various levels of government for their calls of support "as our city continues to cope with the tragic events of the past 24 hours".
The crash is the second involving an Ottawa transit bus in recent years. A double-decker commuter bus crashed into a passenger train in September 2013, killing six people including the bus driver.
-With files from Michelle McQuigge, Jim Bronskill and Jordan Press.