Two people were killed and 33 injured when a bus skidded on ice and crashed just east of Missoula, Montana, early Sunday morning.

The Rimrock Springs bus was carrying 35 passengers, when it slid, rolled and landed on its side on Interstate 90, throwing several passengers from the bus.

Two passengers were pronounced dead at the scene of the crash.

Several other passengers were pinned underneath the bus when emergency crews arrived on the scene.

The Montana Highway Patrol is currently investigating the cause of the accident, but say that the driver, who was also injured in the crash, does not have a history of unreliability or negligence.