Pyongyang challenges world's most power nations
Defiant North Korea fires fourth short-range missile
North Korea test-fired a fourth short-range missile, South Korea's Yonhap news agency said citing officials in Seoul.
Earlier the South's defense ministry said the North had fired three short-range missiles from its east coast between 5:20 p.m. (0820 GMT) and around 7:50 p.m. (1050 GMT).
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