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But Bordeleau said answers will be slow in coming as the police tackle a mammoth investigation.

“There were 90 people on the bus, we have to speak to all of them,” Bordeleau said at a Saturday afternoon news conference.

“It’s a slow, painstaking process. Our goal is to ensure that we get it right.”

Bordeleau said the bus was at or near its full capacity at the time of the collision. Sgt. Cameron Graham, of the force’s collision investigation unit, said investigators would conduct multiple drone flights over the scene of the wreckage, as well as gather data from the vehicle itself and any available video surveillance.

Bordeleau said the bus driver, initially arrested hours after the crash, has since been released unconditionally pending further investigation.

“It’s important that the public does not read into the fact that she was arrested,” he said. “The reasons why we arrested her are part of the investigation, we’re not going to get into that, but our investigative unit is out there collecting all the evidence and then we’ll see where it takes us.”

Bordeleau also backed away from previous reports that two of the those killed were passengers on the bus, while the third was killed on the platform of Westboro station. Bordeleau said new information has surfaced to challenge that account, but did not provide further details.