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Iran enriches uranium at Fordo plant near Qom

10 January 2012 Last updated at 02:25 GMT

Iran has announced that it has begun enriching uranium at a new plant - a move that is likely to worsen its dispute with the west over its nuclear programme.

Washington says it marks a further escalation of Tehran's ongoing violation of United Nations resolutions. France has labelled it a grave violation of international law.

Iran insists its plans are purely for peaceful purposes.

Daniel Griffiths reports.