The Alpine Club of Pakistan said the operation was one of the most technically demanding recovery missions ever carried out on the mountain. It said the bodies of Purja, Chinese climber Zhong Wang and Nepali climbers Nima Sherpa and Kilu Sherpa were brought to Broad Peak base Camp. Mountaineering accidents are common in northern Pakistan because of avalanches, falling ice and rock, extreme altitude and rapidly changing weather. Bodies of foreign climbers who die attempting to summit mountains in Pakistan are typically recovered only at the request of their families and governments. In a statement, the Alpine Club thanked the Pakistani and Nepali recovery teams, including Pakistani mountaineers Sirbaz Khan, Abid Beg and Sherzad, and Nepali climbers Dipen Gurung and Pemba Chhewang Sherpa.