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Sûreté du Québec (SQ) provincial police say one of the drivers, a 33-year-old woman, was driving east on Route 104, veered out of her lane and crashed head-on into oncoming traffic.
She died, and the two young children passengers were taken to hospital with serious but non-life threatening injuries.
A 66-year-old woman in the second vehicle who was sitting passenger also died. The male driver of the second car survived and was brought to hospital, also with serious but non-life threatening injuries.
Provincial police said Route 104 was closed all night to allow accident reconstructionists to piece together the circumstances that led to the crash.
— with files from The Canadian Press