New world news from Time: North Korea Blows Up Liaison Office as It Steps Up Tensions With South

(SEOUL, South Korea) — South Korea says that North Korea has exploded an inter-Korean liaison office building just north of the tense Korean border.

Seoul’s Unification Ministry says the destruction of the building at the North Korean border town of Kaesong happened at 2:49 p.m. Tuesday.

North Korea had earlier threatened to demolish the building as it stepped up its fiery rhetoric over Seoul’s failure to stop activists from flying propaganda leaflets across the border.

Some experts say North Korea is expressing its frustration because Seoul is unable to resume joint economic projects due to U.S.-led sanctions.