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Thea IAEA (International Atomic Energy Agency) Deputy Director General and Head of the Department of Safeguards Herman Nackaerts arrives after a trip with his team to Iran on January 18, 2013 at the Airport Schwechat, in Vienna The chief UN nuclear inspector returned Friday from Iran without a hoped-for deal on investigating its nuclear programme, dampening hopes of progress in renewed talks with world powers. AFP PHOTO / DIETER NAGL