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A trekker walks in front of Mount Thamserku while on his way back from Everest base camp near Pheriche in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest.   Picture taken May 3, 2014.  Navesh Chitrakar/Reuters
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