Defiant North Korea sets off nuclear explosion
UN North Korea
South Korean Ambassador Kim Sook arrives before the U.N. Security Council holds an emergency meeting on North Korea's nuclear test on Tuesday morning. at U.N. headquarters, Tuesday, Feb. 12, 2013. Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States. (AP Photo/Craig Ruttle)






