A US mountain climbing instructor died and two American students were injured when the ice bridge they were crossing on an Argentina peak broke, plunging them into a crevasse, officials of the sponsoring organization said Monday. Matthew Lizotte of Aspen, Colorado, 25, died Sunday while scaling 3,480-meter Mount Tronador in Argentina's Nahuel Huapi National Park, Whitney Montgomery, executive director of North Carolina Outward Bound School, told The Associated Press. Two unidentified students were injured, including one with a fractured arm. The other suffered multiple fractures and a chest injury, but the student's "condition continues to improve," Montgomery said. A third student was released without treatment from the hospital in San Carlos de Bariloche, a small city nestled in the Andean foothills and the jumping-off point for expeditions into the park.