Rwandan genocide UNAMIR), Pierantonio Costa (Italian diplomat who rescued many lives), Antonia Locatelli (Italian volunteer who in 1992, two years before the actual genocide, tried to save 300 or 400 Tutsis by calling officials in the international community and was later murdered by the Interahamwe), Jacqueline Mukansonera (Hutu woman who saved a Tutsi during the genocide), Paul Rusesabagina (the Academy Award nominated film "Hotel Rwanda" is based on his story), Carl Wilkens (the only American who chose to remain in Rwanda during the genocide), André Sibomana (Hutu priest and journalist who saved many lives) and Captain Mbaye Diagne (Senegalese army officer of
Hutu of Rwandan national unity, but has been criticized as an attempt at historical revisionism. Still others suggest that the two groups are related but not identical, and that differences between them were exacerbated by Europeans, or by a gradual, natural split, as those who owned cattle became known as Tutsi and those who did not became Hutu. Mahmood Mamdani states that the Belgian colonial power designated people as Tutsi or Hutu on the basis of cattle ownership, physical measurements and church records. There is an ongoing debate as to whether the Hutu and Tutsi are really separate groups or not;