Two people have been injured and police fear others may be buried in the snow after an avalanche swept across a ski trail near the Swiss town of Andermatt.
The avalanche occurred mid-morning on Thursday while many holiday skiers were enjoying the mountain sunshine the day after Christmas.
A police spokesman said the avalanche was of a considerable size.
Heavy snow in recent days had seen the avalanche danger raised to level three, meaning significant danger, according to the dpa news agency.
The two people who were slightly injured were flown to a hospital by the Alpine rescue service.
Four others were either rescued or removed themselves from the snow and were unhurt.
Police and rescuers searched the snowslide after witnesses said more people might be buried but the operation ended with officers saying there were no more victims.