Vitoria massacre
1976 CE.
Shown on the map at 42.856°, -2.669°.
On March 3, 1976, the Spanish Armed Police Corps used tear gas to force striking workers out of the parish church of San Francisco de Asís in the Basque capital of Vitoria-Gasteiz (Spanish; Vitoria). As the workers left the church, they were shot by police, resulting in five dead and 150 injured with gunshot wounds. The same police later described the events as a massacre. The event inspired Lluís Llach to write the celebrated song Campanades a morts.
Text from the Wikipedia article 1976 Vitoria massacre, licensed CC BY-SA 4.0.