U.N. Peace keepers atrocity (Central African Republic) - BBC News - 16th October 2018

By sheer chance, U.N. peace keepers who committed murders of civilians after they took revenge after one of their own was killed, were caught by accident and three of them spent just three years in jail and the families of the victims didn't even know there had even been a trial. The incident happened in Boali and in the Central African Republic.