The landslide brought rocks and mud to the foot of the village and caused floodwater in the area.
At least eight people were missing after a avalanche in a Swiss mountain town near the Italian border, police said on Thursday.
"Eight people who were on site at the time of the landslide could not be found" for the moment, said in a statement that the cantonal police of Grisons who thinks that majority were hiking at the time of the accident.
Mittner said a massive search-and-rescue operation was scouring a five-square-kilometre (three-square-mile) area, involving some 120 emergency workers, helicopters and rescue dogs.
Police said 12 farm buildings, including barns and stables, had been destroyed by the flow of debris.
The rocks fell from Piz Cengalo in Val Bondasca, a valley close to the village.
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"People left immediately leaving everything behind. They didn't bring anything, because they thought they would be returning quickly", Rauch said. "We hope this was not the case, but it is possible that they had an accident".
An "intensified" search was launched overnight for those who remain unaccounted for, all believed to be adults.
Residents were able to be accommodated in hotels in the surrounding area, including the village of Castasegna on the Italian border.
The cantonal authorities installed the rockfall alarm system - it's a lesson learnt from the bitter experience of the previous huge rockfall in 2012.
In 2000, 13 people died when a landslide struck villages in the canton of Valais.