Activists from anti-North Korea civic group chant slogans during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and prompting its only major ally, China, to call for calm. The placard (top C) reads, ''Kim Jong-un out!'' REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: CIVIL UNREST POLITICS) - RTR3DO8X