Islam arrived in Bosnia-Herzegovina between the late fourteenth and the sixteenth centuries, when Ottoman military and administrative officials settled there. Other Muslim immigrants also established themselves there, including Turks and non-Turkish Muslims. The Islamic population is mostly Serbo-Croatian-speaking Slavic Muslims. Under the Yugoslav government, Muslims were granted freedom of action and material advantages in 1960. In 1967 the Muslims of Bosnia-Herzegovina were recognized as one of the country's constituent peoples and became known as the Muslim Nation. Their privileged status deteriorated as ethnic and religious tensions grew following the downturn of the Yugoslav economy and the collapse of its Communist regime. Islam was politicized by the Democratic Action Party of Alija Izetbegovic, which encouraged religious and political activism among Bosnian Muslim communities. Hostilities between Muslims, Orthodox Serbs, and Catholic Croats resulted in combat and civil war beginning in 1992. Killings of Muslims remain under investigation by the United Nations.