The Yangju highway incident, also known as the Yangju training accident or Highway 56 Accident, occurred on June 13, 2002, in Yangju, Gyeonggi-do, South Korea. A United States Army armored vehicle, returning to base in Uijeongbu on a public road after training maneuvers in the countryside, struck and killed two 14-year-old South Korean schoolgirls, Shin Hyo-sun (Korean: 신효순) and Shim Mi-seon (Korean: 심미선).