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,
Religion in Rwanda to support the new interim government, the very government supporting the genocide. At the same time, churches did not uniformly support the genocide. In the period leading up to the genocide, 1990–1994, major splits emerged within most churches between moderates who promoted democratic change and conservatives allied with the Habyarimana regime. Many of the clergy were Tutsi, and they generally supported democratic reform, but many moderate Hutu within the churches supported reform as well. Churches provided major support to the formation of the new human-rights groups that emerged in the early 1990s. When the genocide began in 1994, some clergy