North Korea has blown up its joint liaison office with the South near the border town of Kaesong, South Korean officials say.
Tensions between North and South Korea have been escalating for weeks, prompted by defector groups in the south sending propaganda into the north.
In recent weeks, North Korea has repeatedly condemned the South for allowing propaganda across the border.
The two states set up the office in Kaesong after talks between North Korean leader Kim Jong-un and his counterpart from the South, President Moon-Jae-in.
North and South Korea are technically still at war because no peace agreement was reached when the Korean War ended in 1953.
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