Page last updated at 21:58 GMT, Monday, 12 April 2010 22:58 UK

Obama warns of nuclear terrorism


The leaders of more than 40 nations are meeting in Washington to assess the risk of terrorists getting hold of nuclear weapons.

President Obama, who is hosting the conference at the White House, opened the event with the warning that this was the biggest threat facing the world today.

Mark Mardell reports.


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