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By Hamid Shalizi and Katharine Houreld KABUL (Reuters) - Afghanistan's powerful vice president, Marshal Mohammad Qasim Fahim, died of natural causes on Sunday, only weeks before the country is due to elect a new leader. Once one of Afghanistan's most feared warlords, Fahim had been a top commander in the Northern Alliance, a group of anti-Taliban militia leaders, after the 1992-96 civil war. "It is with deep sadness that we learn of the passing away of Marshal Mohammad Qasim Fahim, the First Vice-president of the Islamic Republic of Afghanistan. May his soul rest in peace," President Hamid Karzai's office said, declaring three days of national mourning.