Tutsi which the Hutu then in power killed an estimated 500,000–1,000,000 people, largely of Tutsi origin. Victorious in the aftermath of the genocide, the RPF came to power in July 1994. Tutsis speak Rwanda-Rundi as their native language. It is a member of the Bantu subgroup of the Niger–Congo family. Rwanda-Rundi is subdivided into the Kinyarwanda and Kirundi dialects, which have been standardized as official languages of Burundi and Rwanda. Rwanda-Rundi is also spoken as a mother tongue by the Hutu and Twa. Additionally, many Tutsis speak French, the third official language of Rwanda and Burundi, as a lingua franca. The
History of Rwanda dominated by the majority Hutu under President Grégoire Kayibanda. Unsettled ethnic and political tensions were worsened when Juvénal Habyarimana, who was also Hutu, seized power in 1973. In 1990, the Rwandan Patriotic Front (RPF), a rebel group composed of 10,000 Tutsi refugees from previous decades of unrest, invaded the country, starting the Rwandan Civil War. The war ground on, worsening ethnic tensions, as the Hutu feared losing their gains. The assassination of Habyarimana was the catalyst for the eruption of the 1994 genocide, in which hundreds of thousands of Tutsis and some moderate Hutus were killed. The Tutsi RPF conquered