North Korea on Tuesday blew up an inter-Korean liaison office in the country's border city of Kaesong in a major escalation of its stance toward its southern neighbor.North Korean leader Kim Jong Un's sister, Kim Yo Jong, had predicted the destruction of the office in retaliation for anti-Pyongyang leaflets sent by balloon across the border by defector groups and other activists.South Korea's Unification Ministry said the joint liaison office, a four-story concrete building located in the Kaesong Industrial Zone, was blown up at 2:49 p.m.Later Tuesday, North Korea's state-run media also rep…READ FULL ARTICLE