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,
Tutsi closely related to each other than to faraway groups. There are essentially two groups of Tutsi in the Congo (DRC). There is the Banyamulenge that live in the southern tip of South Kivu. They are descendants of migrating Rwandan, Burundian and Tanzanian pastoralists. And secondly there are Tutsi in North Kivu and Kalehe in South Kivu - being part of the Banyarwanda (Hutu and Tutsi) community. These are not Banyamulenge. Some of these Banyarwanda are descendants of people that lived long before colonial rule in Rutshuru - on what's currently Congolese territory. Others migrated or were "transplanted" by the Belgian