Surveillance equipment along the border areas has detected North Koreans cleaning debris and installing these structures which appear to be walls or concrete barriers.
The demolished roads near the Military Demarcation Line (MDL) along the Gyeongui and Donghae lines were built as part of prior inter-Korean projects linking the two Koreas by land amid a thaw in inter-Korean relations.
The Gyeongui line runs from Seoul to the North's Sinuiju on the Chinese border, while the Donghae line connects the east coasts of the two Koreas.
The Joint Chiefs of Staff (JCS) here said that these balloons, which contained propaganda leaflets blaming President Yoon Suk Yeol and his wife Kim Keon Hee, were also found at the presidential compound.
