FILE PHOTO: An artificially triggered avalanche thunders down a mountain side past a 30 meters (98 feet) high pole holding measuring equiptment, at the Vallee de la Sionne in Anzere near Sion, February 3, 2015. REUTERS/Denis Balibouse/File photoAvalanche na Noruega provoca quatro desaparecidosAvalanche na Noruega provoca quatro desaparecidosMundo