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,
Kangura 1993 issue stated that a Hutu soldier angry over the Arusha agreement would soon assassinate the president. The January 1994 issue predicted that Habyarimana would be killed in March. "Kangura" had stopped publishing by 6 April 1994, when the plane carrying Presidents Habyarimana and Cyprien Ntaryamira of Burundi was shot down over Kigali. This sparked the genocide. Over 800,000 people were killed, mostly Tutsis but including Hutu moderates and Hutus who attempted to protect Tutsi from the militias. Hassan Ngeze, the founder, editor and accountant for "Kangura" fled the country as the RPF took control. He was arrested in 1997