Szytnia
On August 20, 1941, the Ukrainian Preczysta holiday, a group of Ukrainian nationalists led by Mitka Zawierucha rampaged across the town and harassed its Jews. Mitka declared that God had sent him to rid the area of Jews and to root them out from among the non-Jews. On the same day, some SS men (including an SS unit from the city of Zhitomir) who had arrived in Korzec, together with Ukrainian auxiliary policemen, attacked Jewish residences, violently arresting Jewish men. According to a testimony, after this roundup Ukrainian policemen bound the hands of several hundred Jewish men (including three members of the Judenrat) and led them to a granary (or barn, according to another testimony) located in the courtyard of a Ukrainian auxiliary police unit. After being held there for a short time, during which their documents were confiscated, the Jewish men (and several Jewish boys) were marched in rows, under guard by Ukrainian auxiliary policemen, 2 kilometers out of Korzec, to the area of a sugar factory near the village of Szytnia. Upon reaching the murder site, they were forced to dig their own graves, and were then shot by men from the SS units.
More information: Yad Vashem
Sukhovolya Forest
On August 8, 1941, the German authorities presented the Judenrat with a list of the names of the most prominent Jewish residents of Korzec, mostly men. They were ordered to report (apparently, at the Ukrainian auxiliary police building), ostensibly in order to be sent to work. On that day, after all the Jews had been rounded up (except for several Jewish men who were released, having been designated as indispensable workers), they were driven in trucks some 8 kilometers northeast of Korzec, toward a forest near the village of Sukhovolya (in the Zhitomir County), where they were shot by a German unit.
More information: Yad Vashem