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By Gopal Sharma and Ross Adkin KATHMANDU (Reuters) - A powerful earthquake struck Nepal and sent tremors through northern India on Saturday, killing more than 1,300 people, touching off a deadly avalanche on Mount Everest and toppling a 19th-century tower in the capital Kathmandu. There were reports of devastation in outlying, isolated mountainous areas after the midday quake of magnitude 7.9, Nepal's worst in 81 years, centered 50 miles (80 km) east of the second city, Pokhara. India was first to respond by sending in military aircraft with medical equipment and relief teams. A police spokesman said the death toll in Nepal alone had reached 1,341, about half of them in the Kathmandu Valley.