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World leaders have agreed to secure all vulnerable nuclear material within four years, US President Barack Obama has said.He said the four-point plan agreed by the 47 leaders 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 the US and Russia agreed to get rid of some weapons-grade plutonium.
"Today we are declaring that nuclear terrorism is one of the most challenging threats to international security," Mr Obama said at the close of the two-day summit.
"We also agreed that the most effective way to prevent terrorists and criminals from acquiring nuclear materials is through strong nuclear security."This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.