 However the killers' actual political orientation and relation to the Organization of Ukrainian Nationalists is still subject to debate.During the four-week pogrom from the end of June to late July, 1941, nearly 4,000 Jews were murdered.On July 25, 1941, a second pogrom, called "Petliura Days" after Symon Petliura, was organized; nearly 2,000 more Jews were killed in Lviv, mostly shot in groups by civilian collaborators after being marched to the Jewish cemetery or to Lunecki prison.