Collision investigators are on the scene of an accident between a school bus and a car, in the town of Sainte-Marthe, just west of Montreal.
The accident happened at about 7:45 a.m. on Highway 201.
Sureté du Québec spokeswoman Sgt. Joyce Kemp said the bus was carrying high school students.
"What we know of the circumstances up until now is that the car was turning when it was hit by the school bus," said Kemp.
"We're still on the scene and we want to establish exactly what happened. We have officers that are specialized in car collision scenes that are there at the moment."
The woman driving the car was injured and was taken to hospital.
Kemp said several students might have been injured and are being checked at the scene.
Highway 201 is closed between the towns of Sainte-Angélique and Saint-Henri.