The tours to Kaesong were suspended in December 2008 due to a political conflict between North and South Korean relating to propaganda balloons. The balloons, filled with information critical of Kim Jong-il and the North Korean regime, were sent into North Korea from just south of the border in South Korea. When South Korea did not respond to North Korean demands to stop the propaganda balloons, North Korea suspended the Kaesong tours. The tours to Kaesong resumed in April 2010, but were again suspended in May 2010 following the ROKS "Cheonan" sinking.