The situation in Rwanda had been influenced in great detail by the situation in Burundi. Both countries had a Hutu majority, yet an army-controlled Tutsi government in Burundi persisted for decades. After the assassination of Rwagasore, his UPRONA party was split into Tutsi and Hutu factions. A Tutsi Prime Minister was chosen by the monarch, but, a year later in 1963, the monarch was forced to appoint a Hutu prime minister, Pierre Ngendandumwe, in an effort to satisfy growing Hutu unrest. Nevertheless, the monarch soon replaced him with another Tutsi prince. In Burundi's first elections following independence, in 1965, Ngendandumwe was elected Prime Minister. He was immediately assassinated by a Tutsi extremist and he was succeeded by another Hutu, Joseph Bamina. Hutus won 23 of the 33 seats in national elections a few months later, but the monarch nullified the elections. Bamina was soon also assassinated and the Tutsi monarch installed his own personal secretary, Leopold Biha, as the Prime Minister in his place. This led to a Hutu coup from which the Mwami fled the country and Biha was shot (but not killed). The Tutsi-dominated army, led by Michel Micombero brutally responded: almost all Hutu politicians were killed. Micombero assumed control of the government and a few months later deposed the new Tutsi monarch (the son of the previous monarch) and abolished the role of the monarchy altogether. He then threatened to invade Rwanda. A military dictatorship persisted in Burundi for another 27 years, until the next free elections, in 1993.