Auschwitz liberation 70 years on: Caroline Wyatt’s family history search

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It’s the 70th anniversary of the liberation of Auschwitz, the extermination camp in Nazi-occupied Poland. Between 1940 and 1945, well over a million people perished in its gas chambers or from starvation, punishment beatings or being executed. The vast majority of them were Jews from across Europe. The camp also housed a long list of Hitler's other enemies: Polish political prisoners, Soviet prisoners of war, Roma, and homosexuals. BBC correspondent Caroline Wyatt has been to Auschwitz to look for the records of her natural grandfather who survived the camp.