The regional government said that a large chunk of the Birch Glacier above Glatten had broken off, causing the landslide, which also buried the nearby Lonza River bed.
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The search for a missing 64-year-old man has been suspended because of unsafe conditions after a huge mass of rock and ice from a glacier crashed down a mountainside in Switzerland, burying the village of Glatten.
The landslide sent plumes of dust skyward and coated with nearly all of the Alpine village with mud that authorities had evacuated earlier this month as a precaution.
State Councillor Stéphane Ganzer told Radio Télévision Suisse (RTS) that 90% of the village was destroyed.
The Cantonal Police of Valais said that a search and rescue operation was temporarily suspended later on Thursday afternoon because of falling debris.
The regional government said in a statement that a large chunk of the Birch Glacier above the village had broken off, causing the landslide, which also buried the nearby Lonza River bed, raising the possibility of dammed water flows.
Video on social media and Swiss television showed that the mudslide near Blatten, in the southern Lötschental valley, partially submerged homes and other buildings under a mass of brownish sludge.
Swiss President Karin Keller-Sutter is expected to visit the area on Friday.
In recent days, authorities had ordered the evacuation of around 300 people, as well as all livestock, from the village amid fears that the 1.5 million-cubic metre glacier was at risk of collapse.
Swiss glaciologists have repeatedly expressed concerns about a thaw in recent years, attributed in large part to global warming, that has accelerated the retreat of glaciers in Switzerland.
The landlocked Alpine country has the most glaciers of any country in Europe and saw 4% of its total glacier volume disappear in 2023.
That was the second-biggest decline in a single year after a 6% drop in 2022.