Two patients had been listed in serious condition on Sunday, but Swan said their conditions have since improved.
Four people died and dozens of others were injured in the crash east of Merritt near the Loon Lake exit, which police have said they suspect was caused by extremely icy road conditions.
Police have not released the names of those who died.
“What we did hear from the front line was just that initial heart-sinking feeling when you hear about this accident and the impacts to those potential patients and their families,” Swan said.
Police have said the road conditions were described “as very poor with ice and snow on the road surface along with rain and hail falling.”
Investigators have asked anyone who witnessed the collision or who has dashcam video of the bus before the crash to please contact their local RCMP detachment.