Story highlights South Korea says it will restart propaganda broadcasts after hiatus of more than 10 years

The U.S.-led United Nations Command says North Korea planted mines on a DMZ patrol route

Two South Korean soldiers suffered severe leg injuries after stepping on the mines

Seoul, South Korea (CNN) South Korea says it will resume broadcasting propaganda messages over its heavily armed border with North Korea in retaliation for landmine blasts that wounded two of its soldiers.

The use of loudspeakers to blare government messages into North Korean territory is a form of psychological warfare that the South Korean Defense Ministry stopped more than a decade ago during a thaw in relations between the two sides.

Restarting the broadcasts is all but certain to infuriate North Korea, which has threatened in the past to destroy the groups of huge speakers that the South set up at the demilitarized zone that separates the two countries.

But the South Korean government is upset over the serious leg injuries suffered by two soldiers who stepped on landmines last week in the demilitarized zone, which is considered to be the most heavily fortified border in the world.

South Korea and the U.S.-led United Nations Command in Korea said Monday that the North Korean military planted the mines in the southern half of the zone along a route patrolled by South Korean troops.

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