Within sight of horrified climbers preparing an assault on Everest, Chinese troops stationed on the Tibet-Nepal border have shot dead at least two Tibetan refugees trying to cross the border. The refugees were trying to reach Nangpa La pass last Saturday and the Everest advance base camp was swarmed by Chinese troops after the shootout. Climbers regularly see caravans of traders and refugees crossing out of Tibet, but this is the first witness report by western climbers of the People’s Liberation Army shooting refugees…