Ottawa Police Chief Charles Bordeleau said the bus was at or near its full capacity of 90 passengers when it slammed into a bus shelter, and police will have to interview everyone on board at that time.
Most of the injured in the crash have been released from hospital, while one remained in critical condition, reports Xinhua news agency.
Police have already spoken with the bus driver who was released unconditionally pending further investigation.
They will also have to survey the wreckage using drones, go over video and data gathered from the bus and bystanders, said the police chief.
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