The bus driver, according to Ottawa police chief Charles Bordeleau was arrested at the scene and taken in for questioning, but he declined to provide further details.
An obviously distressed woman was seen being wheeled away from the bus on a stretcher by paramedics.
She told Global News that what chilled her the most is that she'd been sitting in an identical double-decker bus as she passed, in the same upper-right section that saw the most damage from the impact.
The cause of the disaster, the police initially made no concrete information. Of those transported, 14 were in critical condition and 11 were in serious condition, paramedic chief Myles Cassidy said in the news conference later.
Photos and video from the scene showed emergency responders treating a number of people on the ground, as others used ladders to unload passengers trapped on the bus' upper level.
This is the second deadly collision involving a double-decker bus in Ottawa in the last six years.
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On the images was the hard wrecked the Front of the bus.
Investigators are still trying to figure out how an lost control and slammed into a bus shelter at the Westboro station late Friday afternoon. "I saw one person being lowered from the top floor in a seated position". "I think everyone on my bus felt the same, and then the whole way home no one was speaking".
Ottawa Mayor Jim Watson tweeted he was shocked to hear of the "horrific incident".
Mailloux says his first thought was for his wife and son, who were scheduled to be travelling through the area shortly after the crash.
Canadian Prime Minister Justin Trudeau expressed his condolences on Twitter. The investigation into that case found the cause was a combination of excessive speed, a hard curve before the tracks and driver distraction.