The underground Directorate of Civil Defense in Warsaw, Poland sent a radio message to London, England, United Kingdom: "Since May 15, mass murders have been carried out in Auschwitz. Jews are taken first, then Soviet prisoners of war, and the so-called sick. Mass transports of Hungarian Jews arrive. Thirteen trains per day, 40-50 cars each. Victims convinced that they will be exchanged for German POWs or resettled in the East. Corpses are burned in crematoria and out in the open. Over 100,000 people from Hungary have been gassed to date."
