North Korea has reportedly retaliated for the South’s border propaganda warfare, reinstalling loudspeakers of its own to broadcast anti-Seoul messages along the border between the two countries.

South Korea went back to the practice last week after an 11-year-long hiatus. Seoul made the decision after blaming Pyongyang for a landmine explosion that severely injured two South Korean soldiers who were patrolling the inter-Korean demilitarized zone. North Korea has denied the accusation that it had planted the mines.

A South Korean Defense Ministry official said on Tuesday that North Korea had retaliated by waging its own loudspeaker campaign along the border.

Citing an unnamed military official, South Korea’s public broadcaster KBS reported that the North Korean broadcasts mainly included criticism of South Korea and praises for North Korea’s political system.

The countries muffled the bullhorns in 2004 as part of efforts to ease the tensions between them.

The resumed mudslinging campaigns come as the two sides have failed to engage in any serious talks for months.

Tens of thousands of Korean and American troops have also launched massive military exercises, simulating a full-scale invasion by North Korea, which has denounced the joint drill as provocative.

Seoul and Washington have said the drill is purely defensive in nature. North Korea, however, is bitterly skeptical of the war games, and previously threatened the “strongest military counteraction” if the exercises were held this year.