More than 200 survivors have returned to Auschwitz-Birkenau to commemorate the 75th anniversary of the liberation of the former Nazi extermination camp.

Many of the survivors are elderly Jews who have travelled from around the world, including from Israel, the US, Australia, Peru, Russia and Slovenia.

Others who attended had lost parents and grandparents at Auschwitz or in other Nazi death camps, and many were joined by their own children, grandchildren and great-grandchildren.

Auschwitz was liberated by the Soviet army on 27 January, 1945.

More than 1.1 million people were murdered at the camp, the vast majority of whom were Jewish.

It was established in 1940 and located in the suburbs of Oswiecim, Poland.

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Between 1940 and 1945, it grew to include three main camp centres and a slew of subcamps – each of which was used for forced labour, torture and mass killing.

World Jewish Congress president Ronald Lauder has warned that leaders must do more to fight anti-Semitism, including passing new laws to fight it.

In recent days survivors have drawn on harrowing memories of their incarceration and warned that lessons from the atrocities sanctioned by Adolf Hitler and carried out often by ordinary Germans were in danger of being forgotten.