Origins of Hutu, Tutsi and Twa phenotype, genotype, cultural memory of inhabitants of Rwanda, archeology, and linguistics. Most Tutsis and Hutus carry the E1b1a paternal haplogroup, which is common among Bantu populations. More recent studies have de-emphasized physical appearance, such as height and nose width, in favor of examining blood factors, the presence of the sickle cell trait, lactose intolerance in adults, and other genotype expressions. Excoffier et al. (1987) found that the Tutsi and Hima, despite being surrounded by Bantu populations, are "closer genetically to Cushites and Ethiosemites". Another study concluded that, while the sickle cell trait among the Rwandan Hutu was comparable to that
1996 Burundian coup d'état first democratic presidential election on 27 June 1993, which was won by Hutu Melchior Ndadaye. On 21 October, Ndadaye was assassinated, sparking the Burundi Civil War between Hutu and Tutsi groups. Moderate Hutu Cyprien Ntaryamira became president in February 1994, but both he and Rwandan president Juvénal Habyarimana were assassinated in April that year, an event that sparked the Rwandan Genocide. Ntaryamira was succeeded by another Hutu leader, Sylvestre Ntibantunganya. On 21 July 1996, Hutu rebels attacked a refugee camp in the country and killed more than 300 people. On 23 July, President Ntibantunganya went into hiding at the home