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Investigations into what caused the crash are ongoing.
The Belgian school group was returning from a skiing holiday in Switzerland when their bus crashed head-on into a concrete wall in a motorway tunnel at about 9pm on Tuesday.
Police said the bus was not speeding and everyone aboard had been wearing seat belts when it crashed inside the 2.5-kilometre tunnel, a gateway to the Val d’Anniviers tourist region. No other vehicles were involved.
Investigators were still trying to determine how a modern bus, a rested driver and a seemingly safe tunnel could produce one of the deadliest highway crashes in Swiss history.
One theory being reported across Swiss media today is that survivors of the crash claimed the driver had reached to change a DVD on the onboard entertainment system shortly before the crash. It was unclear whether that could have contributed to the crash, and neither police nor prosecutors commented on the report.
Earlier: Swiss crash: Bodies of victims flown home today>
Poignant blog chronicles joy of Belgian children before crash>
