Grachev murder case
1925 CE.
Shown on the map at 58.000°, 41.494°.
The Grachov murder case was a spree killing that occurred on 26 July 1925 in Ivankovo, Sudislavsky District, Kostromskoy Uyezd, Kostroma Governorate, RSFSR, Soviet Union. Grigory Grachov, embittered by a long-time conflict with other villagers, set a fire to lure them into an ambush before opening fire, killing 11 and wounding 8.
Text from the Wikipedia article Grachov murder case, licensed CC BY-SA 4.0.