Iran began installing an additional 3,000 centrifuges, Iranian Foreign Ministry spokesman Mohammed Ali Hosseini revealed on Sunday.
In October, Iran stepped up uranium enrichment by injecting gas into a second network of 164 centrifuges. Iran produced a small batch of low-enriched uranium - suitable as nuclear fuel but not weapons grade - in February, using its initial cascade of 164 centrifuges at its pilot plant at Natanz.
Earlier this year Tehran said it plans to install 3,000 centrifuges at Natanz by year's end, but it would take 54,000 centrifuges to fuel a reactor.
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