17 January 1968: 31 North Korean commandos crossed the border disguised as South Korean soldiers in an attempt to assassinate President Park Chung Hee at The Blue House. The failed mission resulted in 29 commandos killed, one committed suicide, and the last captured. Two South Korean policemen and five civilians were killed by the commandos. Other reports indicated as many as 68 South Koreans killed and 66 wounded, including about 24 civilians. Three Americans were killed and another three wounded in an attempt to prevent the commandos from escaping back via the DMZ.
October 1968: 130 North Korean commandos entered the Ulchin and Samcheok areas in Gangwon-do. Eventually 110 of them were killed, 7 were captured and 13 escaped.
March 1969: Six North Korean infiltrators crossed the border near Chumunjin, Gangwon-do and killed a South Korean policeman on guard duty.
October 1969: North Korean infiltrators killed four United States soldiers near the southern boundary of the DMZ.
April 1970: Three North Korean infiltrators were killed and five South Korean soldiers wounded at an encounter in Kumchon, Gyeonggi-do.
November 1974: The first of what would be a series of North Korean infiltration tunnels under the DMZ was discovered.
March 1975: The second North Korean infiltration tunnel was discovered.
June 1976: Three North Korean infiltrators and six South Korean soldiers were killed in the eastern sector south of the DMZ. Another six South Korean soldiers were injured.
18 August 1976: The Axe Murder Incident results in the death of two U.S. soldiers and injuries to another four U.S. soldiers and five South Korean soldiers. The incident may not be technically considered an “infiltration” however, as it took place in a neutral zone of the Joint Security Area.
October 1978: The third North Korean infiltration tunnel was discovered.
October 1979: Three North Korean agents attempting to infiltrate the eastern sector of the DMZ were intercepted, killing one of the agents.
March 1980: Three North Korean infiltrators were killed attempting to enter the south across the estuary of the Han River.
March 1981: Three North Korean infiltrators spotted at Kumhwa, Gangwon-do, one was killed.
July 1981: Three North Korean infiltrators were killed in the upper stream of Imjin River.
May 1982: Two North Korean infiltrators were spotted on the east coast, one was killed.
March 1990: The fourth North Korean infiltration tunnel was discovered, in what may be a total of 17 tunnels in all.
May 1992: Three North Korean infiltrators dressed in South Korean uniforms were killed at Cheorwon, Gangwon-do. Three South Koreans were also wounded.
October 1995: Two North Korean infiltrators were intercepted at Imjin River. One was killed, the other escaped.
April 1996: Several hundred North Korean armed troops entered the Joint Security Area and elsewhere on three occasions in violation of the Korean armistice agreement.
May 1996: Seven North Korean soldiers crossed the DMZ but withdrew when fired upon by South Korean troops.
April 1997: Five North Korean soldiers cross the military demarcation line’s Cheorwon sector and fired at South Korean positions.
July 1997: Fourteen North Korean soldiers crossed the military demarcation line, causing a 23-minute exchange of heavy gunfire.
May 26, 2006: Two North Korean soldiers enter the DMZ and crossed into South Korea. They returned after South Korean soldiers fired warning shots.
October 7, 2006: South Korean soldiers fired warning shots after North Korean soldiers cross briefly into their side of the border.