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North Korea has destroyed guard posts in the Demilitarized Zone, as part of a bid to improve relations with the South.
The destruction of the pillboxes on the heavily fortified border came after an agreement with South Korea to "completely destroy" such locations in the region.
Footage provided by South Korea's defence ministry showed guard posts in North Korea destroyed up in thick smoke.
They appear to have been packed with explosives that were detonated remotely.
The explosions sent fragments of rock and fire into the air as the heavily entrenched fortifications were destroyed.
It follows a military pact at a summit last month in North Korea that called for a halt to "all hostile acts", a no-fly zone near the border and the gradual removal of guard posts, firearms and landmines from the DMZ separating the two.