Be careful of atrocity stories. Often they are made up out of whole cloth in order to whip people into a frenzy. The British were masters of this type of propaganda against the German’s in WWI.
Ike made the German locals and the media review the death camps at the end of WW II; he even forced the local mayors and others to bury some of the victims.
Nazi death camps were across Europe; not just Germany and Poland. Some are still there to see the showers, ovens, and such.
Ike knew that the holocaust deniers would show up.