World leaders pledge to act against 'nuclear terrorism'

World leaders gathered in the US capital have agreed to take steps to prevent "nuclear terrorism", which they said is one of the biggest threats to global security.

In a final declaration the 47 nations at the security summit in Washington DC issued a call to secure all vulnerable nuclear material within four years.

Some bilateral agreements on the sidelines were also announced - among them a deal signed by Russia and the US to destroy tonnes of weapons-grade plutonium.

Al Jazeera's Patty Culhane reports. (Apr 14, 2010)

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