A view of the uranium conversion site at Isfahan, Iran , is seen in this DigitalGlobe satellite image released with notations by the Institute for Science and International Security (ISIS) on April 16, 2006. New satellite imagery indicate Iran has expanded its uranium conversion site at Isfahan and reinforced its Natanz underground uranium enrichment plant against possible military strikes, a U.S. think tank said. The ISIS said, in an email sent to news media with attached commercial satellite photos, that Iran has built a new tunnel entrance at Isfahan, where uranium is processed into a feed material for enrichment. (Xinhua Photo)

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