A double-deck city bus smashed into a transit shelter during Friday's rush hour, and Ottawa authorities said three people were killed and 23 injured.
Police Chief Charles Bordeleau said the bus driver was arrested after the crash, but he declined to provide details on why she has been detained. He said police were still investigating the cause of the crash.
Ottawa Hospital's trauma centre said it had received nine patients "in critical condition" from the crash.
Photos posted on Twitter shows extensive damage to the front of the bus, with the roof of a shelter pushed well into the bus' second deck.
The bus has a capacity of 90 people, both sitting and standing.
The crash snarled afternoon traffic as emergency crews descended on the scene.
In 2013, an Ottawa bus collided with a Via Rail train in suburban Barrhaven, killing six people.
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