Helicopters search for three climbers missing in K2 winter attempt

Ali Sadpara of Pakistan, John Snorri of Iceland, and Juan Pablo Mohr of Chile lost contact with base camp

An aerial search was under way on Sunday to find three experienced climbers who lost contact with base camp during a winter ascent of K2, the world's second highest mountain, officials said.

Karrar Haideri, a top official with the Alpine Club of Pakistan, said army helicopters resumed the search in northern Pakistan that began a day earlier for the celebrated Pakistani mountaineer Ali Sadpara and his two companions, John Snorri of Iceland and Juan Pablo Mohr of Chile.