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By Gopal Sharma KATHMANDU (Reuters) - Sherpa climbers aided by helicopters resumed a search on Saturday for four missing guides after an ice avalanche swept the lower slopes of Mount Everest, killing at least 12 in the deadliest accident on the world's highest mountain. "I sat and counted 13 helicopter lifts - 12 were dead bodies flying overhead suspended by a long line from a helicopter," Tim Rippel of Peak Freaks Expeditions wrote in a blog. "Everyone is shaken here at Base Camp. Reality has set in." The ice avalanche struck a perilous passage called the Khumbu Icefall, which is riddled with crevasses and piled with seracs - massive ice boulders or columns that can break free without warning.