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By Gopal Sharma and Ross Adkin KATHMANDU (Reuters) - Nepal ramped up efforts on Sunday to rescue people trapped in the rubble of collapsed buildings after an earthquake devastated the heavily crowded Kathmandu valley, killing at least 1,800, and triggered a deadly avalanche on Mount Everest. Bodies piled up at one hospital in Kathmandu, where police officer Sudan Shreshtha said his team had brought 166 corpses overnight. "I am tired and exhausted, but I have to work and have the strength," Shreshtha told Reuters as an ambulance brought three more victims to the Tribhuvan University Teaching Hospital. Take me along with him also." Authorities also scrambled to provide shelter in the capital, Kathmandu, for thousands of people who spent the night outside in freezing temperatures and patchy rain, too afraid to return to their damaged homes.