Factbox: Who are the world's nuclear powers?

http - March 24th, 2012

(Reuters) - South Korea hosts some 50 world leaders at a two-day nuclear security summit starting on Monday to discuss ways to safeguard nuclear materials and facilities from terrorist groups. It is the second such summit - the first was hosted by U.S. President Barack Obama in Washington in 2010

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IRIB News - March 24th, 2012
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