(Reuters) Iran is installing more centrifuges in an underground plant but does not yet appear to be using them to expand higher-grade uranium enrichment that could take it closer to producing atom bomb material, Western diplomats say.

They say Iran’s production of uranium refined to a fissile concentration of 20 percent, which it started two years ago, seems to have remained steady in recent months after a major escalation of the work in late 2011 and early this year.

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