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,
Islam in Rwanda against the soldiers and militia of the "Interahamwe". Only once the soldiers attacked with machine gun fire were the "Interahamwe" able to enter the mosque and kill the refugees. The number of Rwandan Muslims increased after the 1994 genocide due to large numbers of conversions. Many Muslims had sheltered refugees, both Hutu and Tutsi. Some converts state that they converted to Islam because of the role that some Catholic and Protestant leaders played in the genocide. Human-rights groups have documented both incidents in which Christian clerics permitted Tutsis to seek refuge in churches, then surrendered them to Hutu death-squads, as