An analysis of security-camera footage shows the bus was traveling below the speed limit when it slammed into wall of a tunnel. As has been reported earlier, this was a single-vehicle collision.
COMMENT: Additionally, an autopsy on the driver who was operating the bus at the time revealed "no evidence of excess alcohol."
Police are also investigating the possibility that the driver was distracted while changing a DVD on the bus’s video system, though this has not been confirmed.
A spokeswoman for Valais Hospital has reported that two hospitalized survivors are being held in an artificial coma.
Prosecutors have said they will release new information on causation as soon as it becomes available.