In 2006, Chinese border guards of the People's Armed Police (PAP) opened fire on 75 unarmed Tibetan refugees as they traversed waist-deep snow in the Nangpa La shooting incident, killing 17-year-old Buddhist nun Kelsang Namtso and leading to the disappearance of a further 17 refugees. Despite an attempted Chinese coverup, several foreign climbers at base camps on Cho Oyu managed to video and photograph the situation as it unfolded and the events drew widespread international condemnation when shown to the outside world.