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 landslide sent plumes of dust skyward and coated with mud nearly all of an Alpine village that authorities had evacuated earlier this month as a precaution. State Councilor Stéphane Ganzer told Radio Télévision Suisse that 90% of the village was destroyed.

“An unbelievable amount of material thundered down into the valley,” the Reuters news agency quotes Matthias Ebener, a spokesperson for local authorities as saying.