A World Heritage property can be inscribed on the List of World Heritage in Danger by the Committee when it finds that the property is threatened by serious and specific dangers (see: paragraphs 179-180 of the Operational Guidelines).
Inscribing a site on the List of World Heritage in Danger allows the World Heritage Committee to allocate immediate assistance from the World Heritage Fund. It also alerts the international community to these situations in the hope that it can join efforts to save these endangered sites.
The process of inscribing a site on the List of World Heritage in Danger requires the World Heritage Committee to develop and adopt, in consultation with the State Party concerned, a programme for corrective measures, and subsequently to monitor the situation of the site. All efforts must be made to restore the site's values in order to enable its removal from the List of World Heritage in Danger as soon as possible.
More information: http://whc.unesco.org/en/158/