South Korea will ramp up propaganda broadcasts to the North in response to Pyongyang sending more trash-carrying balloons across the border, Seoul's military said Sunday.

The two Koreas have engaged in a tit-for-tat campaign, with the North sending nearly 2,000 trash-carrying balloons southwards since May, saying it is retaliation for propaganda balloons launched by South Korean activists.

In protest at a latest wave of North Korean balloons, the South Korean military said it was widening the scale of its front-line propoganda broadcasts.