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Daughter of Nepalese mountaineer Ang Kaji Sherpa, killed in an avalanche on Mount Everest, cries as her father's body is brought to the Sherpa Monastery in Katmandu, Nepal, Saturday, April 19, 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) ( Nepal Everest Avalanche )

Nepalese relatives and volunteers shift the body of a Mount Everest avalanche victim after arrival at the Sherpa Monastery in Kathmandu on April 19, 2014. Rescuers on Mount Everest April 19 found the body of a 13th Nepalese guide buried under snow as authorities ruled out hope of finding any more survivors from the deadliest accident ever on the world's highest peak. (PRAKASH MATHEMA/AFP/Getty Images) ( 529080489 )

The mother of Mount Everest avalanche victim Ang Kazi Sherpa weeps as she waits for the body of her son to arrive at Sherpa Monastery in Kathmandu on April 19, 2014. Rescuers searched Mount Everest for bodies as authorities ruled out hope of finding any more survivors from an avalanche that killed at least 12 Nepalese guides in the deadliest accident ever on the world's highest peak. (PRAKASH MATHEMA/AFP/Getty Images) ( 529076780 )

The father (R) and son of Mount Everest avalanche victim Ang Kazi Sherpa comfort each other as they wait for his body to arrive at Sherpa Monastery in Kathmandu on April 19, 2014. Rescuers searched Mount Everest for bodies as authorities ruled out hope of finding any more survivors from an avalanche that killed at least 12 Nepalese guides in the deadliest accident ever on the world's highest peak. (PRAKASH MATHEMA/AFP/Getty Images) ( 529077172 )

A relative of a Mount Everest avalanche victim grieves as bodies arrive at the Sherpa Monastery in Kathmandu on April 19, 2014. Rescuers on Mount Everest April 19 found the body of a 13th Nepalese guide buried under snow as authorities ruled out hope of finding any more survivors from the deadliest accident ever on the world's highest peak. (PRAKASH MATHEMA/AFP/Getty Images) ( 529080847 )

A Nepalese Sherpa Dawa Tashi, who was injured during an avalanche gets treatment at a hospital in Katmandu, Nepal, Friday, April 18, 2014. 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 peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Avalanche )

Hospital staff get ready to receive the injured from an avalanche on the helipad of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014An 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 peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Avalanche )

Fhurbu Sherpa (L), wife of Nepalese mountaineer Dawa Tashi Sherpa who survived an avalanche on Mount Everest, talks to a journalist as she waits at the Grandi International Hospital in Kathmandu on April 18, 2014. At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say.The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. PRAKASH MATHEMA/AFP/Getty Images ( 529063773 )

(FILES) In this photograph taken from an aircraft on April 3, 2013, an aerial view of Mount Everest (C) and The Himalayan mountain range, some 140kms (87 miles) north-east of Kathmandu can been seen. At least nine Nepalese climbing guides have been killed and five others are missing after an avalanche struck Mount Everest early April 18, 2014, officials said, in the worst accident to hit the world's highest peak. PRAKASH MATHEMA/AFP/Getty Images ( 529058029 )

FILE - In this May 18, 2013 file photo released by mountain guide Adrian Ballinger of Alpenglow Expeditions, climbers make their 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 and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Alpenglow Expeditions, Adrian Ballinger, File) ( Nepal Everest Avalanche )

FILE - 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. An avalanche swept the slopes of Mount Everest on Friday, April 18, 2014, along a route used to ascend the world's highest peak, killing at least six Nepalese guides and leaving nine more missing, officials said. (AP Photo/Kevin Frayer, File) ( Nepal Everest Avalanche )

Dawa Yangzum Sherpa, (C), along with other family members of Nepalese mountaineer Dawa Tashi Sherpa who survived an avalanche on Mount Everest, speaks to the media at the Grandi International Hospital in Kathmandu on April 18, 2014. At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say.The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. PRAKASH MATHEMA/AFP/Getty Images ( 529063817 )

Nepalese mountaineer, Dawa Tashi Sherpa, survivor of an avalanche on Mount Everest, lies in the Intensive Care Unit (ICU) at Grandi International Hospital in Kathmandu on April 18, 2014. At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say. The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. PRAKASH MATHEMA/AFP/Getty Images ( 529063954 )

A Nepalese security officer talks on a walky-talky while waiting for a helicopter to arrive with people injured by an avalanche, at the roof top of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014. 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 peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Avalanche )

Hospital staff get ready to receive the injured from an avalanche, on helipad of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014. 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 peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Avalanche )

Ambulances are seen waiting outside the Domestic Airport, waiting for injured people of avalanche to arrive, in Katmandu, Nepal, Friday, April 18, 2014. 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 peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Avalanche )

Fhurbu Sherpa, (R), wife of Nepalese mountaineer Dawa Tashi Sherpa who survived an avalanche on Mount Everest, waits with family members at the Grandi International Hospital in Kathmandu on April 18, 2014. At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say.The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. PRAKASH MATHEMA/AFP/Getty Images ( 529063807 )

(FILES) In this photograph taken on May 19, 2009, unidentified mountaineers approach the Hillary Step while pushing for the summit of Mount Everest as they climb the south face from Nepal. At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say. The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. The previous worst accident occurred in 1996 when eight people were killed over a two-day period during a rogue storm while attempting to climb the mountain. AFP PHOTO / PEMBA DORJE SHERPA ( 529059753 )

(FILES) In this photograph taken on May 23, 2013, unidentified mountaineers look out from the summit of Mount Everest. At least six climbers have been killed after an avalanche struck Mount Everest early April 18, 2014, the president of the Nepal Mountaineering Association told AFP. TSHERING SHERPA/AFP/Getty Images ( 529054810 )