According to a testimony, in the first days of July 1941 a group of Jewish men and their family members (some 100 persons in total), who had been hiding from the German soldiers, were found in the cellar of the Kurman residence in the town, near the Łuck-Równe road. The German soldiers ordered the Jews out of the cellar and lined them up in five rows. They proceeded to shoot four of the rows with machine guns, while the fifth row of Jews was sent back into the cellar, and hand grenades were tossed at them. Afterward, the house was set on fire.

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On July 3 or 4, 1941, a German military unit surrounded several Jewish houses in Klewań and drove their residents (mainly elderly people, women, and little children) into the street. The assembled Jews were taken to the town's market square. The Germans and Ukrainians lined the Jews up in five rows in the square, and shot them with a machine gun and automatic rifles. The victims were killed in two places in the square. According to a testimony, immediately afterward the Germans began to finish off the Jewish survivors with machine guns and pistols. The massacre went on all night long. The same testimony indicates that, after killing all the Jews, the Germans doused the bodies with gasoline and burned them. According to other testimonies, the bodies of the victims of the shooting were left in the market square. Only several days later did the German command permit the Jews to bury these bodies in two pits near the square.

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On the night of April 4-5 (or April 6, according to another testimony), 1942, anti-German leaflets in Polish were posted in Klewań and in the nearby villages of Pokosy and Orzhev. In retaliation, on April 6 (or 8) German security forces, with the assistance of the Ukrainian Auxiliary Police (headed by Pavel Demidovich), arrested 60 residents (Poles and Jews) of these localities, taking them hostage. They were held under arrest at the police station in Klewań. On April 11, 12 out of the 60 hostages were released, while the remaining 48 (18 Poles and 30 Jews) were shot in the back of the head by German security policemen and Ukrainian auxiliary policemen. The shooting took place 300 meters north of the Klewań railway station.

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On May 13 or 15, 1942, the German chief of the Gendarmerie, Fischer, ordered the Judenrat to have all the Jews assemble at the station on the next day. Very few Jews obeyed this order, so the Ukrainian Auxiliary Police immediately began to search for hidden Jews. They managed to find most of them. The Germans and Ukrainian auxiliary policemen then shot all the Jewish arrestees (who seem to have numbered about 600) in the forest approximately 1 km from Klewań. This mass shooting was organized by members of the German Security Police from Równe, with the assistance of the Gendarmerie and the Ukrainian Auxiliary Police.

More information: Yad Vashem