It remains unclear what caused the collapse that destroyed roads and buildings. The police first started an investigation into serious public destruction after the landslide, but now the classification has been changed to environmental crime.

"The head of the preliminary investigation will be Environmental Prosecutor Magnus Clase at the National Unit for Environmental and Labour Cases," says Stefan Gustafsson, who is the police's press spokesman.

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See the drone images from the site. Photo: Mikael Berglund