Żydokomuna), which had also been the reason why "the Germans murdered the Jewish nation". Wyszyński also gave some credence to blood libel stories, commenting that the issue of the use of Christian blood was never fully clarified. The controversial stance of the Polish Roman Catholic Church towards anti-Jewish violence was criticised by the American, British and Italian ambassadors to Poland. Reports of the Kielce pogrom caused a major sensation in the United States, leading the American ambassador to Poland to insist that Cardinal August Hlond hold a press conference and explain the position of the church. In the conference held on 11 July 1946, Hlond condemned the violence, but attributed it not to racial causes but to rumours concerning the killing of Polish children by Jews. Hlond put the blame for the deterioration in Polish-Jewish relations on collaboration with the Soviet-backed Communist occupiers, Jews "occupying leading positions in Poland in state life". This position was echoed by Polish rural clergy and Cardinal Sapieha, who reportedly stated that the Jews had brought it upon themselves. Other reactions Historian Łukasz Krzyżanowski analyzed the reactions to the pogrom and concludes: "Simply put, the Kielce pogrom met with approbation in many circles." He documents that some meetings held to commemorate the victims were interrupted by antisemitic shouting and groups of workers could not reach agreement to pass resolutions condemning the pogrom. Evidence of Soviet involvement Some sources claim the massacre was instigated by the Soviet-backed Communist security corps, for propaganda purposes, attempting to discredit Poland's anti-Communist stance and to maintain totalitarian control over the country. As the top-secret case files were destroyed, the academic inquiry is ongoing with regard to possible secret coordination with the NKVD by the Moscow-Communist-controlled 'Polish' authorities. There has been considerable controversy over possible outside incitement. The idea that the event was secretly provoked or inspired by Soviet intelligence services has been put forward, and a number of similar scenarios were offered. None has yet been proven by the post-communist investigation, due to the paper trail (see below) having been destroyed by Communist-controlled intelligence agents, even though an NKVD officer was present at the riots. In 2001–04 the Institute of National Remembrance (IPN) conducted an investigation into the pogrom and closed the case stating (without entering into details) that the events of 4 July 1946 were a result of a mishap. Another communiqué published by the IPN two years later