10/22/2015 12:19 EDT | Updated 10/22/2016 01:12 EDT

Woman injured when vehicle rear-ends school bus dies in Alberta

LETHBRIDGE, Alta. — An Alberta woman who was a passenger in a minivan that police say rear-ended a school bus has died.

Lethbridge RCMP say the bus was stopped on Highway 25 near Lethbridge on Monday afternoon to let a student off when a brown minivan hit the bus from behind.

Police say the driver told them the school bus had its stop-sign arm out and warning lights activated at the time.

Mounties say students and school bus driver were shaken up but not injured, and that a woman in the minivan was taken to hospital in Lethbridge with non-life threatening injuries.

RCMP say the woman's condition changed for the worse and she was taken to a Calgary hospital where she died Wednesday night.

Police say the woman was in her mid-60's and from the Picture Butte area.

"This terrible tragedy should serve as a reminder of the importance of driver awareness and safety on our roads especially during times when our school buses are on the highways picking up and delivering our children," RCMP said in a news release.