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
Sainte-Famille Church genocide of 1994 thousands of Tutsi and Hutu took refuge in the church and many were massacred, following the death of President Juvénal Habyarimana. Witnesses said that the priest in charge of the church, Father Wenceslas Munyeshyaka, armed himself and helped Hutu militias take people from the church to be killed. Munyeshyaka was responsible for many of the killings, agreeing to "let the militia pick off those they wanted every now and then." Wenceslas Munyeshyaka hated the Tutsis and called them the "inyenzis". Following this incident and similar ones in other churches, many of the Rwandan people converted to Islam.