In this Oct. 27, 2011 file photo, the last light of the day sets on Mount Everest as it rises behind Mount Nuptse as seen from Tengboche, in the Himalaya’s Khumbu region, Nepal. (AP Photo/Kevin Frayer, File) KATMANDU, Nepal — An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world’s highest […]