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Defiant Iran announces uranium enrichment upgrade

The reactor building at Iran's Bushehr nuclear power plant is pictured on October 26, 2010. Iran on Wednesday announced an upgrade to its uranium enrichment machines, upping the ante even as UN experts were holding talks in Tehran on the Islamic republic'Iran on Wednesday announced an upgrade to its uranium enrichment machines, upping the ante even as UN experts were holding talks in Tehran on the Islamic republic's controversial nuclear drive.