In Switzerland, few stranded persons have been airlifted by helicopter at Zermatt after heavy snow and a power cut stranded thousands of visitors. An estimated 13,000 people were stuck in Zermatt after snow closed mountain lifts, ski runs, walking paths and train services to the village. <br/><br/>In the town of Visp, about 30 km down the valley from Zermatt, 20 people were evacuated from their homes, Swiss broadcaster SRG reported yesterday. Nobody was injured. <br/><br/>Zermatt town officials said the airlift service was just arranged for those wishing to leave. A tourist office spokeswoman said power has returned and the atmosphere in the village is relaxed and comfortable.<br/><br/>Swiss mountain communities have been in the spotlight for geological risks since August, when the side of a mountain collapsed in the southern canton of Grisons, killing eight hikers. Their bodies have not been found.