Survivors of the Nazi's notorious Auschwitz death camp are taking center stage at the memorial service to mark 80 years since its liberation by Soviet troops.

Ruth Cohen, a 94-year-old American Holocaust survivor, returned to the Auschwitz concentration camp in Poland for the first time. She recalled seeing family members before they were separated for the last time at the camp.

The dwindling numbers offer a stark representation of the declining population of survivors who are still able to tell their stories.