Reports from South Korea's Yonhap.......>

NORTH KOREA: Reports from South Korea's Yonhap News that an explosion has been

heard from the North Korean border town of Kaesong. Media reports that the

inter-Korean liaison office may have been blown up by North Korean forces. 

- On Saturday, NK leader Kim Jong-Un's sister Kim Yo-Jong warned that the south

could face the "tragic scene of the useless North-South joint liaison office

completely collapsed." 

- The move comes in retaliation to a campaign of North Korean defectors sending

balloons with anti-Pyongyang messages back across the border from the South. 

- The North has threatened further retaliation, and could seek to push troops

into demilitarized zones in a major escalation in tensions along the 38th

parallel.