On the 80th anniversary of the liberation of the Auschwitz extermination camp run by the Nazis, Pope Francis said the horror of the annihilation of millions of Jews must never be forgotten or denied.

On Jan. 27, 1945, the Red Army of the Soviet Union liberated around 7000 prisoners at the camp, where the German Nazis had killed an estimated 1.1 million people, the vast majority being Jews.

“Let us also remember the many Christians, among whom were many martyrs. May we all to work together to eradicate the scourge of anti-Semitism, along with all forms of religious persecution,” the pontiff said.