Hutu Rwanda, this led to the "Social revolution" and Hutu violence against Tutsis. Tens of thousands of Tutsis were killed and many others fled to neighboring countries, such as Burundi, Uganda and expanding the Banyamulenge Tutsi ethnic group in the South Kivu region of the Belgian Congo. Later, exiled Tutsis from Burundi invaded Rwanda, prompting Rwanda to close its border with Burundi. In Burundi, a campaign of genocide was conducted against Hutu population in 1972, and an estimated 100,000 Hutus died. In 1993, Burundi's first democratically elected president, Melchior Ndadaye, who was Hutu, was believed to be assassinated by Tutsi officers,
Rwandan genocide the capital and the country. An estimated 2,000,000 Rwandans, mostly Hutu, were displaced and became refugees. The genocide was planned by members of the core Hutu political elite, many of whom occupied positions at top levels of the national government. Perpetrators came from the Rwandan army, the Gendarmerie, and government-backed militias including the "Interahamwe" and "Impuzamugambi". The genocide took place in the context of the Rwandan Civil War, a conflict beginning in 1990 between the Hutu-led government and the Rwandan Patriotic Front (RPF). The latter was made up largely of Tutsi refugees whose families had fled to Uganda after the