The NKVD prisoner massacre in Dubno was a Soviet war crime conducted by the NKVD in the city of Dubno, then in occupied Poland and now in Ukraine. Between 23 and 25 June 1941, following the German invasion of the USSR, the Soviets executed an estimated 500 to 550 prisoners held in the Dubno prison. This atrocity was one of several prisoner massacres carried out by the Soviet secret police and army during the summer of 1941.
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