[1] They followed the assassination of Prime Minister Pierre Ngendandumwe on 15 January 1965, and were won by the ruling Union for National Progress.
[2][3] In response, Mwami Mwambutsa IV dissolved Parliament[4] on March 4[5] and called for new elections.
[6] Despite the decisive victory by Hutu candidates in the election, King Mwambutsa IV appointed a Tutsi prince, Léopold Biha, as Prime Minister.
Tensions finally erupted into violence following an attempted coup by Hutu army officers in October 1965.
The failed coup was followed by a major purge of Hutus in the armed forces.