U.S. Ambassador to the United Nations Susan Rice arrives at arrives at 

U.S. Ambassador to the United Nations Susan Rice arrives at arrives at U.N. headquarters for an emergency Security Council meeting on North Korea's nuclear test 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)
Associated Press
U.S. Ambassador to the United Nations Susan Rice arrives at arrives at U.N. headquarters for an emergency Security Council meeting on North Korea's nuclear test 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)
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