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Auschwitz was never bombed by the allies before, during of after the liberation.
morale and propaganda.
it was not a viable target.
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Auschwitz III (aka Monowitz or Buna) was in fact bombed - because it was a chemicals factory ...
Please also see related question.
Auschwitz I Stammlager, Auschwitz II Birkenau and Auschwitz III Monowitz
Auschwitz Birkenau was established at Auschwitz but Auschwitz is now called Oświęcim.