Iran Has Begun Uranium Enrichment At A Heavily Fortified Site Near The Holy City Of Qom, The UN Has Confirmed. -- BBC

The International Atomic Energy Agency (IAEA) - the UN's nuclear watchdog - said the process had begun at the underground Fordo plant.

Iran says it plans to carry out medium-level uranium enrichment - which, say analysts, is an important step towards making it weapons-grade.

Tehran insists its nuclear programme is for peaceful energy purposes.

The existence of Fordo in the north of the country only came to light after it was identified by Western intelligence agencies in September 2009.

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More News On Iran's Nuclear Program

Uranium enrichment begins at Iranian site -- CNN
Iran criticised over enrichment at Qom bunker -- Financial Times
Iran confirms uranium enrichment at second underground facility -- The Telegraph
UN confirms Iran enriching uranium in bunker -- Jerusalem Post/Reuters
UN agency confirms Iran nuke work at bunker -- Miami Herald/AP
Iran opens new enrichment facility -- Xinhuanet
New Iran nuclear plant up and running: IAEA -- AFP
Iran 'begins enriching uranium' at underground bunker -- The Guardian
Iran’s Uranium Enrichment at Fortified Site Draws U.S. Criticism -- Bloomberg Businessweek
US: Iran uranium enrichment a 'further escalation' -- Jerusalem Post/Reuters