North Korea warned it would attack South Korean loudspeakers and other propaganda facilities along its border, warning it could even turn the capital Seoul into a "sea of flame".
The general staff of the Korean People's Army made the threat in a declaration carried by the official Korean Central News Agency. It said the North would launch an all-out military strike to blow up any propaganda facilities along its border and that its retaliation would be "a merciless strike foreseeing even the turn of Seoul… into a sea of flame".
In 2004 the rival Koreas ended decades of propaganda as relations warmed following a landmark summit in 2000. But South Korea resumed radio broadcasts to the North last month and installed a dozen propaganda loudspeakers along the border.
The resumption of psychological warfare was part of punitive steps taken against the North over the alleged sinking of the Cheonan.