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https://en.wikipedia.org/wiki/Katyn_massacre

Katyn massacre
Trzy krzyze.jpg
Katyn-Kharkov-Mednoye memorial in Świętokrzyskie Mountains, Poland

Katyn massacre is located in the Soviet Union
LocationKatyn Forest, Kalinin and Kharkiv prisons in Soviet Union
DateApril–May 1940
Attack type
Mass murder
Deaths22,000
VictimsPolish military officers and intelligentsia prisoners of war
PerpetratorsSoviet Union (NKVD)
Map of the sites related to the Katyn massacre