By David Chance and Jack Kim
The reclusive North said the test was an act of self-defense against “U.S. hostility” and threatened further, stronger steps if necessary.
It said the test had “greater explosive force” than the 2006 and 2009 tests. Its KCNA news agency said it had used a “miniaturized” and lighter nuclear device, indicating that it had again used plutonium which is more suitable for use as a missile warhead.
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North Korea Carries Out Biggest Nuclear Test
