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Page last updated at 02:00 GMT, Wednesday, 14 April 2010 03:00 UK

Nuclear stock security tightened

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The leaders of almost 50 countries have pledged to secure all vulnerable nuclear material within four years.

US President Barack Obama said the joint action plan agreed at a summit in Washington would make a real contribution to a safer world.

The plan calls for every nation to safeguard nuclear stocks and keep material out of terrorists' hands.

Earlier, Russia and the US signed an agreement to dispose of 68 tonnes of surplus weapons-grade plutonium. Richard Lister reports.

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