Jahorina was an area of major strategic importance during the Bosnian war. Some areas of the mountain, including areas near the resort, still contain land mines. Extensive de-mining activities have taken place after the war. Skiing in borders of Jahorina ski resort is safe from mines and out-of-bounds areas are marked by skull-and-crossbones signs. Some off-course slopes were mined during the war and many remain risky. On October 30, 2011 a Slovenian paraglider was critically injured on Mount Jahorina when he landed in a minefield by mistake.