Helicopter crews have transported scores of tourists stranded at the top of one of Switzerland’s most popular mountain resorts after a mudslide cut off road access until at least next week. Teams from the Air Zermatt rescue and helicopter service led the operation for what Swiss media said were about 2,200 tourists, mostly Swiss, caught at the Saas Fee resort in the southern Valais region. Valais authorities said an overnight downpour into Thursday caused several rivers in the Saas Valley to burst their banks between the towns of Stalden and Saas-Balen. They said the road was likely to be clos…