The document summarizes events in Rwanda in 1994, when between April and July Hutu extremists killed an estimated 800,000 Tutsi and moderate Hutus in a genocide. Tensions between the Hutu and Tutsi ethnic groups had been rising for decades, and erupted into mass killings after the presidents of Rwanda and Burundi were killed in a plane crash. The UN peacekeeping force in Rwanda was overwhelmed by the speed and scale of the killings, and several countries evacuated their personnel but did not act to stop the genocide.