A ski coach has crashed in Switzerland killing 28 people, including 22 children and injuring another 24.

The coach, which had been carrying 52 people, was travelling between the Swiss Alps to Lommel and Heverlee in Belgium when it hit the wall of a tunnel in the canton of Valais, according to reports.

The passengers were on their way home from a ski trip in the Swiss Alps when the incident occurred on Tuesday evening. Both of the drivers were killed at the scene.

According to the Belgian foreign ministry most of the children were approximately 12 years old and the bus had been hired by a Christian group.

Belgian Foreign Minister Didier Reynders said: “It is incomprehensible. There were three buses and only one was in an accident, without any contact with another vehicle.”