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,
Genocides in central Africa Ituri conflict and the mass murder of Pygmies known as "Effacer le tableau". In Uganda, 300 thousand people were murdered during the regime of Idi Amin and 500 thousand during the rule of his successor, Milton Obote. Amin's genocides targeted the Acholi and Lango peoples; these two groups went on to murder other groups (mainly the Baganda) under Obote's regime. In the early 1970s, over 150 thousand Hutu people were killed by Tutsi people in Burundi by order of General Michel Micombero. Twenty years later, one million Tutsi people were murdered by Hutu people during the 1994 Rwandan genocide. In