Nepal Everest Avalanche

In this May 18, 2013, file photo released by mountain guide Adrian Ballinger of Alpenglow Expeditions, a climber pauses on the way to the summit of Mount Everest in the Khumbu region of the Nepal Himalayas. An avalanche swept down a climbing route on Mount Everest early Friday, April 18, killing at least 12 Nepalese guides in the deadliest disaster on the world's highest peak. (AP Photo/Alpenglow Expeditions, Adrian Ballinger)