An army artillery unit in the border town of Paju, Gyeonggi Province, mistakenly fired a 155mm towed howitzer while on training, they said. The shell landed some 14 kilometers north of the army base, on a hill on the South Korean side of the DMZ, they said.
"The army unit was not engaging in an artillery firing exercise. A shell that had been loaded previously was mistakenly fired," an army official said.
The military authorities sent a message to North Korea explaining that the firing was unintentional. North Korea has given no response, they said.