At least four climbers are dead after a weekend of summit attempts on Mount Everest. German Eberhard Schaaf, 61, died from apparent altitude sickness Sunday at around 28,700 feet on the South Summit. South Korean Song Won-Bin, 44, who has been missing since Saturday, collapsed with acute mountain sickness and fell off a cliff at The Balcony at 27,600 feet. Nepali-born Canadian climber Shriya Shah, 33, died Sunday, and the body of 55-year-old Chinese climber Ha Wenyi was found near 28,200 feet. Neither cause of death has been confirmed. "Most of these deaths occur due to high-altitude sickness," Asian Trekking founder Ang Tshering Sherpa said. "Climbers spend their energy on the ascent and they are exhausted and fatigued on the descent." A Nepali guide was also reported missing on Saturday. Successful summits include Ueli Steck's climb without oxygen on Friday and 73-year-old Tamae Watanabe's ascent on Saturday. Watanabe is the oldest woman ever to climb the mountain.
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