A US national has been detained in North Korea after crossing the border from South Korea, a UN body has said.

The United Nations Command, which operates the Demilitarised Zone and joint security area said the man did not have authorisation to enter the country.

The Demilitarised Zone separates the two Koreas and is one of the most heavily fortified areas in the world.

It is filled with landmines, surrounded by electric and barbed wire fencing and surveillance cameras and has armed guards on alert 24 hours a day.

It is unclear why the US national crossed the border on Tuesday.

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