Gnjilane massacre
1999 CE.
Shown on the map at 44.091°, 15.450°.
The Gnjilane killings was the abduction, torture and mass murder of Kosovar Serb civilians in the Yugoslav town of Gnjilane by members of the Kosovo Liberation Army's (KLA) Gnjilane group from June to October 1999, in the aftermath of the Kosovo War.
Text from the Wikipedia article Gnjilane killings, licensed CC BY-SA 4.0.