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North Korea has blown up a joint liaison office with the South near the North's border town of Kaesong.
The move comes just hours after the North renewed threats of military action at the Korean border.
The site was opened in 2018 to help the Koreas - officially in a state of war - to communicate. It had been empty since January due to Covid-19 restrictions.
In a statement, South Korea warned it would "respond strongly" if the North "continues to worsen the situation".