 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.