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On Saturday, North Korea said it will hold a rare Workers’ Party conference in September to choose new top leaders, a move experts say may be aimed at giving Kim Jong-un a top party job.

Tension has been high on the Korean Peninsula over the deadly sinking of a South Korean warship in March that the South blames on Pyongyang. Seoul has asked the U.N. Security Council to punish Pyongyang, which flatly denies it launched any attack and warns any punishment would trigger war.