The group also placed 2,000 one-dollar bills, 1,000 USB drives and 500 booklets inside the balloons.

North Korea declined to approve trips by South Korean nationals other than the players and the national team support staffers for the rare sports exchange between the two sides, leaving fans and journalists in the dark.

Slamming North Korea for turning the rare match into "combat" between the two sides, Park Sang-hak, the head of the group, also denounced the South Korean government for what he called a failure to properly raise the issue over the North's lack of cooperation.

The group has sent similar leaflets in the past despite the government's push to stop such campaigns over worries they might hamper its efforts to reduce tensions and improve inter-Korean ties. (Yonhap)