Sites in Africa have been marked as such for a variety of reasons, such as deforestation and hunting, civil war, threats to and hostage taking of reserve staff, oil and gas projects and mining, declines in biodiversity, and structural damage to buildings. Three sites were formerly declared as being in danger, but have since lost the status: the Ngorongoro Conservation Area (1984–1989), the Rwenzori Mountains National Park (1999–2004), and Tipasa (2002–2006). The Garamba National Park and Timbuktu have also lost their statuses in 1992 and 2005, respectively, but later regained it in 1996 and 2012. Despite its large number of endangered sites and the circumstances surrounding them, African World Heritage Sites have never been stripped of their title, something that has only occurred twice.