North Korea conducted nuclear tests in 2006 and 2009.
Tuesday’s test was carried out using a “miniaturized and lighter nuclear device with greater explosive force than previously,” the news agency said.
U.S. intelligence officials assessed that the explosion yield was several kilotons.
Mr. Obama said North Korea’s nuclear-weapons and ballistic-missile programs constitute threats to U.S. national security and to international peace. He also spoke on the phone Tuesday with South Korean President Lee Myung-bak.
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Ashish Kumar Sen is a reporter covering foreign policy and international developments for The Washington Times.
Prior to joining The Times, Mr. Sen worked for publications in Asia and the Middle East. His work has appeared in a number of publications and online news sites including the British Broadcasting Corp., Asia Times Online and Outlook magazine.
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