South Korea's defense ministry tells VOA News that plans to send tens of thousands of leaflets northward by ballon have been delayed because of wind conditions, but they could go aloft as early as Thursday. Officials say the leaflets are intended to inform North Koreans about the sinking of the South Korean naval vessel. The North views Southern pamphleteering as hostile propaganda.

South Korea's military is using loudspeakers along the border, silenced for six years, and re-instituting FM broadcasting to the North.

North Korea's state television newscaster announced such propaganda will not be tolerated.

The North Korean newscaster says it will open fire on the South Korean loudspeakers and destroy them.

Pyongyang says a resumption of the propaganda campaign will also compel it to totally shut down the Kaesong industrial complex, where more than 100 South Korean firms employ about 42,000 North Korean workers.

The two countries have no diplomatic relations and technically remain at war following a 1953 truce which ended the three-year Korean War.

The United States, which has 28,000 troops in South Korea, has hurriedly announced plans for several joint military exercises in the coming month. In the past, Pyongyang has strongly condemned U.S.-South Korean drills, claiming they are preparations for an invasion of the North.