1993 ethnic violence in Burundi
Mass killings of Tutsis were conducted by the majority-Hutu populace in Burundi from 21 October to December 1993, under an eruption of ethnic animosity and riots following the assassination of Burundian President Melchior Ndadaye in an attempted coup d'état. The massacres took place in all provinces apart from Makamba and Bururi, and were primarily undertaken by Hutu peasants.
Source: Wikipedia — 1993 ethnic violence in Burundi (CC BY-SA 4.0)