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,
Initial events of the Rwandan genocide who were moderates or Tutsi friendly. The fighting which began late on the evening of April 6 did not end for another hundred days, leaving hundreds of thousands dead, missing, and displaced. (See: Rwandan_Genocide#Genocide) Initial events of the Rwandan genocide The assassination of presidents Juvénal Habyarimana and Cyprien Ntaryamira in the evening of April 6, 1994 was the proximate trigger for the Rwandan genocide, which resulted in the murder of approximately 800,000 Tutsi and a smaller number of moderate Hutu. The first few days following the assassinations included a number of key events that shaped the subsequent course of the