(NSI News Source Info) TORONTO, Canada - March 27, 2012: US President Barack Obama (2nd L) greets US soldiers and family members before boarding Air Force One at Osan Air Base in Osan outside Seoul on March 27, 2012 to leave South Korea after attending the 2012 Seoul Nuclear Security Summit.
World leaders on March 27 pledged strong action to combat the threat of nuclear terrorism, including minimising civilian use of highly enriched uranium (HEU) that can be used to make bombs. (Photo - Getty)
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