In November 1944, the Red Cross asserted there was no evidence of “installations for exterminating civilian prisoners” in Auschwitz.

Polish resistance intelligence, gathered by Jan Karski, confirmed the Holocaust was taking place, and Witold Pilecki who infiltrated Auschwitz itself, confirmed this was an extermination camp.

The Polish government-in-exile sent an official note in 1942 to the Foreign Ministers of 26 countries that had signed the United Nations Declaration, informing them of the Holocaust.

"The Mass Extermination of Jews in German Occupied Poland", was the first official report on the Holocaust to inform the Western public about the Holocaust.

Count Raczyński wrote in it that one-third of the three million Polish Jews had already been killed  – actually, an underestimate.

Though the document contained extensive information on the persecution and murder of Jews in Poland, its effect was limited because many people outside German-occupied Europe found it difficult to believe the Germans were systematically exterminating Jews.

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