The U.N. Security Council called an emergency meeting Monday after world leaders reacted with outrage to North Korea's latest nuclear test.
North Korea earlier said it had tested the weapon in an underground explosion, provoking an angry response from the world's governments.
It had threatened to conduct the test if the U.N. Security Council did not apologize for imposing sanctions on North Korea after it tested a rocket April 5.
The secretive communist state also apparently test-fired a short-range missile Monday, the White House said.
The Security Council called on its members to discuss the reported test Monday at 4 p.m. ET.
The United States and many other countries denounced the test. Even China, North Korea's strongest ally, said it opposed the test.
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