North Korea has blown up an inter-Korean liaison office, according to South Korean officials.
Seoul's Unification Ministry said North Korea destroyed the building in border town Kaesong on Tuesday afternoon.
The site was a way for the two to communicate, but has been closed since January due to COVID-19 restrictions.
Recently there have been rising tensions after North Korean defectors fled to the South, who, alongside activists, were flying anti-North Korea propaganda brochures over the border via balloons.
On Tuesday morning, North Korea's military was considering sending troops into a demilitarised buffer zone.
Kim Yo-jong, the sister of North Korea's leader Kim Jong-un, had warned of retaliatory measures against South Korea.
Photos from Yonhap News Agency show smoke rising from what appears to be a building complex.
They reported Yo-jong had warned that South Korea would witness a "tragic scene of the useless North-South joint liaison office completely collapsed".
