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,
1996 Burundian coup d'état first democratic presidential election on 27 June 1993, which was won by Hutu Melchior Ndadaye. On 21 October, Ndadaye was assassinated, sparking the Burundi Civil War between Hutu and Tutsi groups. Moderate Hutu Cyprien Ntaryamira became president in February 1994, but both he and Rwandan president Juvénal Habyarimana were assassinated in April that year, an event that sparked the Rwandan Genocide. Ntaryamira was succeeded by another Hutu leader, Sylvestre Ntibantunganya. On 21 July 1996, Hutu rebels attacked a refugee camp in the country and killed more than 300 people. On 23 July, President Ntibantunganya went into hiding at the home