Three people were killed and 23 others were injured just before rush hour on Friday after a double-decker bus crashed at a busy transit station in Ottawa.
Several people found themselves trapped on the bus' upper level following the crash, and most serious injuries happened on the vehicle's upper right side, said Ottawa Police Chief Charles Bordeleau.
Three people were killed and almost two dozen injured in a collision involving an OC Transpo double-decker bus at Westboro station Friday afternoon.
Police said investigators worked through the night to identify all three victims and contact their families and loved ones.
"That work continues this morning and no information on the identity of the three will be released at this time", a news release stated.
OC Transpo, which is in charge of Ottawa's public transportation, tweeted on its verified account, "Buses are being detoured as a result" of the collision.
During a press conference, Ottawa Police said the bus driver had been taken into custody.
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"We're taking every necessary step to establish all of the facts and will co-operate fully with any investigation", said John Manconi, the general manager of Ottawa's transit service, OC Transpo.
The investigation will take a long time and likely will mean the closure of the busway and nearby roads for at least many hours, Bordeleau said.
Officials from Transport Canada and Ontario's Ministry of Transportation are also investigating.
He went outside and came across a "chaotic" scene, with at least 30 emergency vehicles, including seven or eight fire trucks, and lots of police and bystanders, he said.
Bilal Gill, a passenger on the upper deck, told broadcaster CBC News that people at the front were pinned under their seats.
Witnesses told local media the OC Transpo Route 269 bus swerved moments before slamming into the bus shelter overhang at the Westboro station west of downtown.