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A general view of the Vorkutinskaya mine in Russia's northern Komi region is seen in this undated file photo provided by Russia's Emergency Ministry. An explosion at the Russian Vorkutinskaya coal mine on February 11, 2013 killed nine people and eight more were feared trapped under rubble at the pit in the northern Komi region, the Interior Ministry said. REUTERS/Russian Emergency Ministry/Handout (RUSSIA - Tags: DISASTER ENERGY) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE WAS PROCESSED BY REUTERS TO ENHANCE QUALITY. AN UNPROCESSED VERSION WILL BE PROVIDED SEPARATELY - RTR3DMLT