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.
Wounded soldiers forced to have amputations
One of the soldiers had to have part of each leg amputated, and the other had to have one foot removed at the ankle, the South Korean Defense Ministry said.
Before South Korea announced the resumption of propaganda broadcasts, Maj. Gen. Koo Hong-mo, director of operations of the South's Joint Chiefs of Staff, warned that North Korea would "pay a harsh price" for laying the mines. He demanded that Pyongyang apologize for planting the landmines and severely punish whoever is responsible.
There was no immediate comment on the matter Monday in North Korean state media.
The South Korean Defense Ministry declined to specify when exactly the propaganda broadcasts would resume. It said sound from the the giant loudspeakers can travel about 24 kilometers (15 miles) at night and about 12 kilometers on weekdays.
Professor Lee Jung-hoon said we have not heard the end of the tensions.
"When we have the psychological warfare -- the leaflets or the loudspeakers -- basically the message is: the current leader is doing a very bad job, that their human rights are being violated, and that there's a much better world outside that they should be aware of," said Lee, an associate professor of international relations at Yonsei University in Seoul.
He said North Korea will not take kindly to criticism against Kim.
"For them Kim Jong Un, as his father and his father's father was, is not just a political leader, he's a deity figure," he said. "For the leadership, just the fact that there's the public condemnation and criticism of this godlike figure is just totally unacceptable."
And North Korea, he said, will have some sort of reaction.
"Absolutely they will respond," he said. "I can't say in what way."
U.N. Command condemns truce violations
The U.S.-led United Nations Command in Korea said that its investigation into the explosions found that the North's Korean People's Army had breached several parts of the armistice on the Korean Peninsula by planting landmines along a South Korean patrol route in the southern half of the demilitarized zone.
"The United Nations Command condemns these violations of the Armistice Agreement, and will call for a general officer level-dialog with the Korean People's Army," the U.N. Command statement said.
The U.N. Command, which monitors the armistice, said that the investigation had found that the wooden box landmines were recently planted, ruling out the possibility that they were old mines that might have been displaced by rain or other elements over the years.
Staff members from South Korea, the United States, New Zealand and Colombia took part in the investigation, the U.N. Command said.
Previous border tensions
The demilitarized zone has divided North and South Korea since the Korean War ended in 1953 with an armistice rather than a formal peace treaty. As a result, the two countries technically remain at war.
Tension has flared in the past around sensitive points on the their de facto border, including North Korea's shelling of an island in 2010
that killed two South Korean marines.
Roughly 28,000 U.S. troops are based in South Korea.