South Korean officials said North Korea launched more balloons likely carrying trash towards the South on Sunday, days after Seoul restarted blaring anti-Pyongyang propaganda broadcasts across the border in retaliation for the North’s repeated balloon campaigns.

The Cold War-style psychological battle between the two Koreas is adding to tensions on the Korean Peninsula, with the rivals threatening stronger steps against each other.

South Korea’s Joint Chiefs of Staff said the North Korean balloons were flying north of Seoul, the South Korean capital, after crossing the border.

It said the public should be alert for falling objects and report to police and military authorities if they see any balloons on the ground.

North Korea’s latest balloon-flying is the ninth of its kind since late May.

North Korea has floated more than 2,000 balloons to drop waste paper, scraps of cloth, cigarette butts, waste batteries and even manure on South Korea, though they have so far caused no major damage in South Korea.

North Korea has said the balloons were launched in response to South Korean activists sending political leaflets to the North via their own balloons. (AP)