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,
Hotel Rwanda President Juvénal Habyarimana, a Hutu, was shot down. Following that incident, the genocide began. Hutu extremists belonging to the Interahamwe militia launched plans to destroy the entire Tutsi civilian population. Tutsi and people suspected of being Tutsi were killed in their homes and as they tried to flee the country. It is estimated that some 200,000 people participated in the perpetration of the Rwandan genocide. Hotelier Paul Rusesabagina of the Belgian owned luxury Hôtel des Mille Collines, used his power and influence to personally save both Tutsi and Hutu refugees. Rusesabagina regularly bribed Rwandan Hutu soldiers and kept militias outside