An avalanche swept down a slope of Mount Everest on Friday along a route used to ascend the world's highest peak, killing at least 13 people in the mountain's deadliest disaster. NBC News confirmed that all of the dead were Sherpa guides. The guides had gone early in the morning to fix the ropes for hundreds of climbers when the avalanche hit them just below Camp 2 around 6:30 a.m. local time, Nepal Tourism Ministry official Krishna Lamsal told The Associated Press. Tilak Ram Pandey, an official at the ministry's mountaineering department, later told Reuters that some other people were...