I believe you heard a bus rollover between Mt. Crested Butte and Crested Butte. I had heard 6 on board plus driver with no serious injuries. I did not hear the scanner traffic, but happened to be waiting at the bus stop, waiting for that particular bus to arrive. When we finally got a ride down the mountain, we drove right by the rolled bus. Word on the street was whiteout conditions then the driver was hit by a gust of wing and sent off the road rolling down an embankment. Attached is a crappy camera phone picture taken from the next bus down, driving past the accident. If you look close, you can see the bus on it's side with the emergency hatch open.