The mountainous canton of Valais is often hit by natural disasters with heavy loss of life due to its topography.
WSJ: Police Say 28 Dead in Swiss Bus Crash
"We are used to disasters in the canton of Valais, " said Dr. Jean-Pierre Deslarzes, director of the local emergency medial services.
"This is a tragic day for the whole of Belgium, " Mr. Di Rupo said during a news conference in Sion, the capital of the canton of Valais.
In the valleys of what is now the Swiss canton of Valais, small groups of farmers left their villages and set off east across the mountain passes in search of new lands.
BBC: Hiking the Alpine Walserweg trail
The attack happened on Wednesday at around 21:00 (20:00 GMT) in the village of Daillon in Valais canton, 100km (60 miles) east of Geneva.
BBC: Switzerland gunman kills three in Daillon in Valais
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