An early morning avalanche on the slopes of Mount Everest has killed at least 12 Nepalese Sherpas and left several more missing in what is being called the deadliest day in the mountain’s history. A wall of snow overcame the local guides at 6:30 a.m. on Friday morning near the mountain’s Camp 2 as they were preparing ropes on the route to the summit ahead of the spring climbing season. “Rescuers have already retrieved four bodies and they are now trying to pull out two more bodies that are buried under snow,” Ang Tshering Sherpa, president of the Nepal Mountaineering Association, told AFP. Sherpas are famous for their ability to weather high altitudes and are widely regarded as some of the best mountaineers in the world.