Fatima Massacre
1976 CE.
Shown on the map at -34.445°, -58.981°.
The Fatima massacre refers to an incident in Fátima, Buenos Aires, Argentina, where 30 prisoners in the custody of the federal police were illegally detained, drugged and shot. On August 20, 1976, the bodies of the victims were blown up.
Text from the Wikipedia article Fatima massacre, licensed CC BY-SA 4.0.