U.S. conducts first nuclear test , angering world governments . Emergency meeting of White House called . North Korea earlier said it had tested the weapon in an underground explosion , provoking an angry response from the world 's governments . North also tested a short-range missile , White House says . North Korea says nuclear test was in `` blatant defiance '' of White House .
U.S. conducts first nuclear test , angering world governments . Emergency meeting of White House called . North also tested a short-range missile , White House says . North Korea says nuclear test was in `` blatant defiance '' of White House .