An American and a Swiss mountaineer have died while attempting to climb Mt. Everest, their expedition organizer in Nepal said Thursday, making them the first fatalities on the world's highest peak this season.Kathmandu-based Seven Summit Treks identified the American as Puwei Liu, 55, and the Swiss national as Abdul Waraich, 41. Both died Wednesday, it said."Waraich summited the mountain and was returning when he died from exhaustion below the summit," Tashi Sherpa of the expedition agency said by phone. "Liu died at Camp 4 of the mountain from exhaustion."Nepal's popular spring season for …READ FULL ARTICLE