U.S. President Barack Obama opens a global nuclear summit in Washington with the warning that the international community must be vigilant about nuclear safety to prevent terrorist groups like Islamic State from securing nuclear materials. Rough Cut (no reporter narration).
ROUGH CUT (NO REPORTER NARRATION) STORY: U.S. President Barack Obama on Friday (April 1) opened a global nuclear summit in Washington, a high-level diplomatic process that started and will end on his watch. With less than 10 months left in office to follow through on one of his signature foreign policy initiatives, Obama is convening leaders from more than 50 countries this week for his fourth and final Nuclear Security Summit, The recent deadly militant attacks in Brussels have fueled concern that Islamic State could eventually target nuclear plants and develop radioactive "dirty bombs," a topic that may well be uppermost in leaders' minds as they meet. Despite significant progress by Obama in persuading dozens of countries to rid themselves of bomb-making materials or reduce and safeguard stockpiles, much of the world's plutonium and enriched uranium remains vulnerable to theft. A boycott by Russian President Vladimir Putin, apparently unwilling to join in a U.S.-dominated gathering at a time of increased tensions between Washington and Moscow, adds to doubts that the meeting will yield major results.