Ottawa police say they released the driver of the OC Transpo bus driver unconditionally pending further investigation after arresting her and bringing her in for questioning after the crash Friday.
An obviously distressed woman was seen being wheeled away from the bus on a stretcher by paramedics.
At least 3 people were killed and more than a dozen others were injured, according to the Ottawa Citizen newspaper.
Ottawa Police Chief Charles Bordeleau told reporters that the most serious injuries occurred on the top right side of the bus.
While the cause of the crash is still unknown, Mailloux said he has often noted the express buses travelling through the area at high speeds.
Most of the injured in the crash have been released from hospital, while one remained in critical condition.
He said the upper deck of the bus was badly damaged in the crash, trapping several people inside for some time.
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Bordeleau made it clear while police expect to release the scene Saturday, work collecting evidence, analyzing photos, videos and data, along with interviewing the almost 90 people on the bus is going to be a "slow, painstaking process".
A double-deck city bus smashed into a transit shelter during rush hour on Friday.
The crash is the second involving an Ottawa transit bus in recent years. I know that the people of Ontario have them in their hearts tonight.
Due to the investigation, OC Transpo said its Saturday routes serving Westboro and Dominion stations are on detour between Lincoln Fields and Tunney's Pasture stations. I felt like vomiting a couple of times.
Ottawa Mayor Jim Watson tweeted he was shocked to hear of the "horrific incident".
"My first thoughts are with those who have been injured and their families".
Canadian Prime Minister Justin Trudeau expressed his condolences on Twitter. In that case, an investigation found that the cause was a combination of excessive speed, a hard curve before the tracks and driver distraction from video monitors showing the upper deck.