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Obama, world leaders discuss keeping nuclear weapons from ISIS

U.S. officials estimate there's some 2000 metric tons of nuclear material being housed in civilian and military programs around the world.

President Obama, South Korea's President Park Geun-Hye (L) and Japan's Prime Minister Shinzo Abe, after a trilateral meeting on the sidelines of the Nuclear Security Summit in Washington, DC, March 31, 2016. (Photo by Mandel Ngan/AFP/Getty)
President Obama, South Korea's President Park Geun-Hye (L) and Japan's Prime Minister Shinzo Abe, after a trilateral meeting on the sidelines of the Nuclear Security Summit in Washington, DC, March 31, 2016. AFP/Getty Images
By  Ron Allen

Ron Allen