A Buddhist monk performs rituals next to a casket containing the dead body of Nepalese mountaineer Ang Kaji Sherpa, killed in an avalanche on Mount Everest, offer prayers at the Sherpa Monastery in Katmandu, Nepal, Sunday, April 20, 2014. Rescuers were searching through piles of snow and ice on the slopes of Mount Everest on Saturday for four Sherpa guides who were buried by an avalanche that killed 12 other Nepalese guides in the deadliest disaster on the world's highest peak. The Sherpa people are one of the main ethnic groups in Nepal's alpine region, and many make their living as climbing guides on Everest and other Himalayan peaks. (AP Photo/Niranjan Shrestha)