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.

Jan. 27 is International Holocaust Remembrance Day to memorialize the six million Jews and millions of other victims of Nazi persecution.

The 80th anniversary of the liberation of Auschwitz by Soviet troops is being observed this year. Auschwitz, largest of the Nazi concentration camps, remained operational from May 1940 until its liberation in January 1945.