Origins of Hutu, Tutsi and Twa of neighboring people, it was almost non-existent among Rwandan Tutsi. Presence of the sickle cell trait is evidence of survival in the presence of malaria over many centuries, suggesting differing origins. Regional studies of the ability to digest lactose are also supportive. The ability to digest lactose among adults is widespread only among desert-dwelling nomadic groups that have depended upon milk for millennia. Three quarters of the adult Tutsi of Rwanda and Burundi have a high ability to digest lactose, while only 5% of the adults of the neighboring Shi people of eastern Congo can. Among Hutu, one in three
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