British boy killed in coach crash © Reuters/Denis Balibouse It has emerged that a British boy was one of 28 people who died in a coach crash in Switzerland. A spokesman for St Lambertus School in Heverlee, Belgium, confirmed that Sebastian Bowles, who was 11, was among 22 children killed in Tuesday's crash. Twenty four other youngsters were hurt, some of them seriously. The bus, with 52 people on board, was heading back from a ski holiday in the Swiss Alps when it hit a wall in a tunnel. Sebastian's British father and Belgian mother arrived in Brussels on Thursday night after identifying their son's body in Switzerland. The authorities are working to release the bodies as soon as possible but some have still not been formally identified. Belgium has declared a national day of mourning. An investigation is underway into the crash, with three possible causes highlighted so far - human error, a health problem with the driver or a technical problem with the bus.