UNHCR's mandate has gradually been expanded to include protecting and providing humanitarian assistance to internally displaced persons (IDPs) and people in IDP-like situations. These are civilians who have been forced to flee their homes, but who have not reached a neighboring country. IDPs do not fit the legal definition of a refugee under the 1951 Refugee Convention, 1967 Protocol and the 1969 Organization for African Unity Convention, because they have not left their country. As the nature of war has changed in the last few decades, with more and more internal conflicts replacing interstate wars, the number of IDPs has increased significantly.