On July 1, 1946, an eight-year-old Polish boy, Henryk Błaszczyk, was reported missing by his father Walenty. On his return, the boy made up a story that he had been detained by an unknown man. A neighbour suggested to Henryk that this man may have been a Jew or a gipsy. Two days later, the boy, his father and the neighbour went to a local police station; in passing the 'Jewish house' in Planty St., Henryk pointed at a man nearby who, he said, had imprisoned him in the house's cellar. At the police station Henryk repeated his story that he had been kidnapped and specified the Jews and their house as involved. Three patrols, each of about 10 police, were dispatched on foot to the Jewish house at Planty street. One arrested the man pointed out by the child, others started searching for place where Henryk had been allegedly detained. 'When the police were questioned about what had happened, they spread false reports about Jews holding a Polish boy, and they also talked about searching for murdered Polish children in a Jewish home. During the morning the case came to the attention of other local state and military organs, including (LWP, the KBW,and the GZI). About 100 soldiers and five officers were dispatched about 10:00. They had not been told anything of the circumstances, but soon picked up rumors from people in the street about kidnap and murder. On July 4, 1946 a mob of local townsfolk, including police and soldiers began to perpetrate a major pogrom which resulted in 42 Jews being murdered and 40 more injured. This was out of about 200 Holocaust survivors who after the war had returned to the town from German Nazi concentration camps and elsewhere.
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from the article: Polish bishop accuses Jews of using Holocaust as propaganda