was designated as a national park and renamed the Bwindi Impenetrable National Park. It covered an area of . The national park was declared in part to protect a range of species within it, most notably the mountain gorilla. The reclassification of the park had a large impact on the Batwa pygmy people, who were evicted from the forest and no longer permitted to enter the park or access its resources. Gorilla tracking became a tourist activity in April 1993, and the park became a popular tourist destination. In 1994, a area was incorporated into the park and it was inscribed on the World Heritage List. The park's management changed: Uganda National Parks, since renamed the Uganda Wildlife Authority, became responsible for the park. In 2003 a piece of land next to the park with an area of was purchased and incorporated into the park. In March 1999, a force of 100–150 former Rwandan Interahamwe guerrillas infiltrated across the border from the DRC and kidnapped 14 foreign tourists and their Ugandan guide from the park headquarters, eventually releasing six and murdering the remaining eight with machetes and clubs. Several victims were reportedly tortured, and at least one of the female victims was raped. The Ugandan guide was doused with gasoline and lit on fire. The Interahamwe attack was reportedly intended to "destabilize Uganda" and frighten away tourist traffic from the park, depriving the Ugandan government of income. The park was forced to close for several months, and the popularity of the gorilla tours suffered badly for several years, though attendance has since recovered due to greater stability in the area. An armed guard also now accompanies every tour group. Geography and climate Kabale town to the south-east is the nearest main town to the park, away by road. The park is composed of two blocks of forest that are connected by a corridor of forest. The shape of the park is a legacy of previous conservation management, when the original two forest blocks were protected in 1932. There is agricultural land where there were previously trees directly outside the park's borders. Cultivation in this area is intense. The park's underlying geology consists of Precambrian shale phyllite, quartz, quartzite, schist, and granite. The park is at the edge of the Western Rift Valley in the highest parts of the Kigezi Highlands, which were created by up-warping of the Western Rift Valley.