In 1963, King Mwambutsa appointed a Hutu prime minister, Pierre Ngendandumwe, but he was assassinated on 15 January 1965 by a Rwandan Tutsi employed by the US Embassy. The assassination occurred in the broader context of the Congo Crisis during which Western anti-communist countries were confronting the communist People's Republic of China as it attempted to make Burundi a logistics base for communist insurgents battling in Congo. Parliamentary elections in May 1965 brought a majority of Hutu into the parliament, but when King Mwambutsa appointed a Tutsi prime minister, some Hutu felt this was unjust and ethnic tensions were further increased. In October 1965, an attempted coup d'état led by the Hutu-dominated police was carried out but failed. The Tutsi dominated army, then led by Tutsi officer Captain Michel Micombero purged Hutu from their ranks and carried out reprisal attacks which ultimately claimed the lives of up to 5,000 people in a precursor to the 1972 Burundian Genocide.