IMJINGAK, South Korea — South Korean activists have rallied against North Korea near the heavily fortified border, burning placards with the images of North Korean leaders.

The activists criticized leader Kim Jong Il over North Korea's artillery attack on the South in November during a rally at the South Korean border town of Imjingak on Sunday.

The activists also unsuccessfully tried to launch thousands of propaganda leaflets by balloons toward North Korea. The balloons flew southward and burst in mid-air in a southern town before crossing the border because of strong winds.

The activists burned placards with the images of a North Korean national flag and the photos of Kim and his son and heir-apparent Kim Jong Un before flying the balloons.