A bus carrying Belgian tourists crashed into the wall of a tunnel in the Valais region of Switzerland, killing 28 people, 22 of them children, police said on Wednesday.<br/> <br />The bus, transporting 52 people, mostly school children from Lommel and Heverlee in Flanders, crashed on Tuesday night in the canton of Valais, which borders Italy, police said.<br/> <br />The bus was heading back to Belgium from a skiing holiday camp in Val d'Anniviers, a Valais ski resort.<br/> <br />24 more children onboard the bus were injured, some seriously, and were being treated in hospital, police said.<br/> <br />The bus was traveling towards Sitten from Siders when it crashed into the tunnel wall.<br/> <br />Two drivers in the bus were also killed. The cause of the accident was not yet known, police said.
