Iran is enriching uranium to up to 60% purity, close to weapons grade, underground for the first time at its Fordow plant, the U.N. nuclear watchdog said on Tuesday, adding that Iran is also planning a massive expansion of its enrichment capacity. Iran earlier on Tuesday said it had started to enrich uranium to up to 60% at a second site, Fordow, having already done so at its above-ground pilot plant at Natanz for more than a year. At that pilot plant just two cascades, or clusters, of advanced centrifuges are enriching to that level.
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