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President Barack Obama said on Sunday that efforts by al Qaeda to acquire atomic weapons posed the biggest security threat, and world leaders meeting this week must act with urgency to combat this danger.
Obama, speaking on the eve of an unprecedented 47-nation summit in Washington aimed at thwarting nuclear terrorism, said he expected "enormous progress" at the conference toward the goal of locking down loose nuclear material worldwide.
"The central focus of this nuclear summit is the fact that the single biggest threat to U.S. security -- both short-term, medium-term and long-term -- would be the possibility of a terrorist organization obtaining a nuclear weapon," Obama told reporters.