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World leaders urge action on nuclear security, terror

British Prime Minister David Cameron, French President Francois Hollande, US President Barack Obama and China's President Xi Jinping take part in a P5+1 meeting during the Nuclear Security Summit in Washington.
British Prime Minister David Cameron, French President Francois Hollande, US President Barack Obama and China's President Xi Jinping take part in a P5+1 meeting during the Nuclear Security Summit in Washington.