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Young people and students dance in Pyongyang in a photo released by North Korea's official news agency on April 9, 2013

Young people and students dance in Pyongyang to celebrate the 20th anniversary of late leader Kim Jong Il's election as chairman of North Korea's National Defence Commission, in a photo released by North Korea's official Korean Central News Agency (KCNA) on April 9, 2013. South Korean and US forces raised their alert status to "vital threat" Wednesday before an expected North Korean missile test

Inside North Korea