'Shots fired' across Korea border

The border between the two Koreas is heavily fortified

Shots have been fired across the border between North and South Korea, the defence ministry in Seoul has said.

The South returned fire after North Korean soldiers fired several shots at a South Korean guard post in the demilitarised zone, the ministry said.

No-one was injured on the South side, officials said. There was no immediate word from the North.

The demilitarised zone between North and South Korea is the most heavily-fortified border in the world.