North Korean GPS blocking sparks cyber war fears. Phil Muncaster. 11th May 2012.
"South Korea will lodge an official complaint with the UN over its reclusive neighbour after GPS-blocking by the North for over a week disrupted hundreds of flights, in what some officials are worried could be the first signs of a looming cyber war [...] Over 500 aircraft flying to or from South Korea’s main airports of Incheon and Gimpo reported GPS signal failures from 28 April to 6 May, with the government tracing the blocking signals to the North Korean border city of Kaesong. Over 120 shipping vessels reportedly also had their signals jammed...."