Content Section
(FILES) In this photograph taken on May 19, 2009, unidentified mountaineers descend from the summit of Everest.    Four climbers have been killed returning from the summit of Mount Everest, tour agents and officials said on May 21, 2012, bringing the season's death toll to six on the world's highest peak.  AFP PHOTO/COURTESY OF PEMBA DORJE SHERPA/FILES        (Photo credit should read STR/AFP/GettyImages) Pembra Dorje Sherpa/AFP/Getty; Getty, file