Apparently on July 8, 1941, a Security Police unit arrived in Poczajów and arrested 120 (or 106, according to other testimony) Jewish men, including the rabbi of Poczajów Eliezer Urecki, and imprisoned them in the cellar of the police station. While being kept there, the Jewish men were cruelly beaten. Of these arrested men 30 were selected and taken, under the heavy guard of Ukrainian auxiliary police and several German soldiers, with shovels, toward the forest near Belaya Gora, located 3 kilometers from Poczajów in the direction of the town of Krzemieniec. Upon their arrival, the Germans ordered these men to dig a pit ostensibly for burying dead German horses. At 2 p.m. (or, according to other testimony, in the evening) the chief of the Ukrainian auxiliary police Iosif Myslynskyi, together with a Security Police unit and Gendarmerie men (German rural order police) forced the remaining arrestees to the pit. After their arrival at the pit, the victims, including those 30 who had dug the pit, were ordered to lie down. They were then shot to death with machine-guns in the back of the head by members of the Security Police unit. The shooting lasted about two hours.

More information: Yad Vashem