The NKVD prisoner massacre in Lutsk was a Soviet war crime conducted by the NKVD and NKGB in the city of Lutsk, situated in occupied Poland (present-day Ukraine). On June 23, 1941, during the second day of the German invasion of the USSR, the Soviets executed a vast majority of the prisoners held in the Lutsk prison, predominantly Ukrainians and Poles. The estimated number of victims is believed to be around 2,000, although there are varying estimates from different sources. This atrocity was one among many prisoner massacres carried out by the Soviet secret police and army during the summer of 1941.
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