zurich three people die separate avalanche accidents swiss alps police say monday man ski close 2,844-metre high hofathorn southern canton wallis die carry away avalanche monday morning 39-year-old wallis region quickly find recover friends confirm dead scene emergency service police graubunden east switzerland say tourist go miss saturday also find dead 31-year-old frenchman try climb glattwang mountain alone saturday afternoon ski girlfriend return search launch man body find ravine sunday morning police say trigger avalanche descent carry kilometre rocky terrain separately one three walkers bury snow drift wallis saturday die swiss broadcaster srf report quote police group hike height 2,700 meter st luc region accident happen one manage get free make emergency call allow others rescue three fly hospital one 29-year-old woman swiss canton vaud die injuries sunday even srf say version story correct paragraph four make clear graubunden east switzerland west three people die avalanche swiss alps