Sky News reports that Switzerland's prosecutor-general, Olivier Elsig, has said that neither the speed of coach or excess alcohol in driver were the cause of the fatal accident in the Alps.
A nation grieves for the 28 victims of the coach crash in Switzerland as a military aircraft has carried the bodies home.
First pictures have been released of the young victims of the Swiss bus crash. They are on display for people to pay their condolences.
A British boy was among the 28 people killed in a horrific bus crash in a Swiss tunnel.