North Korean youth at a coal mine have said they are ready to help “blow up” the inter-Korean liaison office at Kaesong, the country’s ruling party daily reported Monday, amid a mounting domestic propaganda campaign.

The report follows remarks from Kim Yo Jong, a top official and sister of leader Kim Jong Un, warning that the liaison office — opened in the North Korean city of Kaesong in 2018 — would soon be “completely collapsed” in future.

South Korea’s government spent a total of KRW9.7 billion ($8.6 million) on the refurbishmentof the joint facility, which was originally intended to