The correct answer to this open question is the following.
People outside of Germany reacted to reports from allied forces who liberated the camps with horror and indignation. The international community could not believe the atrocities committed by the Nazis in the concentration camps. The world was in horror.
The Soviet troops liberated people from the Auschwitz camp in January 1945. The US troops liberated other camps in Dachau and Flossenburg. British troops did the same in Bergen-Belsen.
