Kigali Rwanda's highest buildings, including the 20-storey Kigali City Tower, are located in the CBD, as are the headquarters of the country's largest banks and businesses. Other buildings in the CBD include the upmarket Serena, Marriott and Mille Collines hotels, the University Teaching Hospital of Kigali, the national university's College of Science and Technology, and government buildings such as the National Bank of Rwanda and the Ministry of Finance and Economic Planning. To the south west of the CBD, and also on the Nyarugenge Hill, is the suburb of Nyamirambo. This was the second part of the city to be settled,
Kigali down near Kigali Airport. This was the catalyst for the Rwandan genocide, in which 500,000–1,000,000 Tutsi and politically moderate Hutu were killed in well-planned attacks on the orders of the interim government. Opposition politicians based in Kigali were killed on the first day of the genocide, and the city then became the setting for fierce fighting between the army (mostly Hutu) and the Tutsi-dominated Rwandan Patriotic Front (RPF). On 8 April, Rwandan government forces attacked the RPF base in the parliament building from several directions, but RPF troops successfully fought back. The RPF then began an attack from the north