"It has been proven that the runners received unauthorized help from onlookers in the terrain, incisions and small paths prepared for them (the Chinese) and only they were aware of," the International Orientation Association (IOF) wrote in a statement.

Military world games are organized by the International Military Sports Association (CISM) but both the IOF and the Swedish orienteering federation have drawn attention to the cheating.

This weekend and the beginning of next week, the IOF will host the World Cup Final in Canton, China.