Bolzano, March 22 - Three people were killed on Thursday when an avalanche hit a group of mountaineers on the Gran Zebrù mountain in Alto Adige, rescue sources said. Two Austrian tourists were killed immediately and a 32-year-old Austrian tourist died later in hospital of her injuries. The victims were named as Andreas Klein, 28, from Hall in Tirol; Martin Ferschmann, 49, from St. Georgen; and Tamara Hoebinger, 32, from Waidhofen an der Thaya.