GENEVA (AP) — A 64-year-old man remained missing Thursday after a huge mass of rock and ice from a glacier crashed down a Swiss mountainside the day before.

The Cantonal Police of Valais said that a search and rescue operation was underway for the man, whose name wasn't made public, and it involved a drone with a thermal camera.

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.

In recent days, authorities had o

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