"The only thing we know is there are injuries", said Acting Sergeant Tina Hunt of the Ontario Provincial Police.
Update: The westbound lanes have now reopened on Highway 401 near Prescott following the bus crash investigation by the OPP.
Provincial police say one of the people injured in a tour bus crash in eastern Ontario on Monday has died.
The OPP says the bus drove off the highway and struck a rock cut.
"It definitely looked very surreal and chaotic", said the man, who would only give his name as Robert.
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A manager at Massachusetts-based Union Tour Express said he had heard that one of their buses was involved in the collision, but did not have any further information. Photos and videos from the scene showed that the vehicle's front and right side suffered serious damage.
The bus belongs to travel company LLTOURTU, which is registered in the United States.
Spokeswoman Abby McIntyre told The Canadian Press that all the patients the hospital had received were "Mandarin speaking".
At least two helicopters, a land ambulance and a fixed-wing aircraft were sent to the scene, according to a spokesman for Ornge Air Ambulance.
According to initial reports, the bus was carrying 37 people, of whom at least 24 were taken to area hospitals. Officials from the Chinese embassy visited the injured in hospital and are notifying families.