A former Nazi death camp officer dubbed the "bookkeeper of Auschwitz" went on trial in Germany on Tuesday, with almost 70 Holocaust survivors and victims' relatives at the court.
Oskar Groening, 93, is being tried on 300,000 counts of "accessory to murder" for deported Hungarian Jews who were sent to the gas chambers, and faces up to 15 years jail.
Given the advanced age of most German war crimes suspects, Groening is expected to be among the last to face justice, 70 years after the liberation of the concentration camps at the end of World War II.
Media interest in the trial of the frail widower, who entered court using a Zimmer frame, is intense, with several Auschwitz survivors set to appear as witnesses or co-plaintiffs.
The bespectacled Groening appeared calm as he took his seat wearing a white striped shirt and a beige sleeveless sweater.
"To me he is a murderer because he was part of the system of mass murder," said Romanian-born Auschwitz survivor and co-plaintiff Eva Kor, 81.
"This may be our last chance to get information on Auschwitz from one of the perpetrators," Kor, a U.S. citizen who lost her parents and two siblings in Auschwitz, told Bild daily.
"To me this is not about a jail term for him, but about researching and dealing with the crime."
Eva Fahidi-Pusztai, a Hungarian Auschwitz survivor, said on news channel NTV that "one has always had the feeling that justice has not been served, and so this provides a sense of satisfaction, to some extent."
The more than 100 co-plaintiffs, lawyers and reporters watched the trial via a live video link in another building near the court in Lueneburg, southeast of the port city of Hamburg.
Prosecutors claim Groening served as a bookkeeper who sorted and counted the money taken from those killed, collecting cash in different currencies from across Europe.
He also performed "ramp duty," guarding the luggage stolen from deportees as they arrived by rail at the extermination and forced labor camp in Nazi-occupied Poland, they say.
Groening, unlike most former Nazis, has spoken at length in a string of media interviews about what he did and saw at Auschwitz, although he claims he is not guilty of harming any inmates.
Prosecutors say that by serving at the camp, he played a role in the mass murder that claimed over a million lives, building their case around 300,000 deaths from May to July 1944.
Defense lawyer Hans Holtermann has said Groening would speak shortly after the opening of the trial, which is currently scheduled to run until July 29.
Groening has said he first opened up about his past in 1985, when a member of his stamp collectors' club handed him a book written by a Holocaust denier.
He returned it with the message "I saw everything. The gas chambers, the cremations, the selection process ... I was there."
He went on to write a memoir for his family, shared his recollections with the German press and appeared in a BBC documentary.
During the war, Groening has said, he saw the mass extermination as "a tool of waging war. A war with advanced methods."
He has recounted acts of barbarism he witnessed, including when an SS guard on the railway ramp killed a baby.
"The crying had bothered him," Groening said. "He smashed the baby's head against the iron side of a truck until it was silent."
Groening has insisted that he is personally not guilty of any murders, describing his role as "a small cog" in the killing machine.
"If you can describe this as guilt, then I am guilty," he has said. "Legally speaking I am innocent."
The defendant has previously been cleared by German courts, but the legal basis for prosecuting ex-Nazis changed in 2011 with the trial of former death camp guard John Demjanjuk.
While previously courts had punished defendants for individual atrocities, Demjanjuk, a former Ukrainian citizen and later Ohio auto worker, was sentenced to jail on the basis of having served at a camp, Sobibor, also in occupied Poland.
Christoph Heubner, vice president of the International Auschwitz Committee, representing survivors, said the new trial was important because "many perpetrators never saw the inside of a courtroom and died without having been confronted with their guilt."
"This is an enduring scandal that has caused great indignation among the survivors."
Some 1.1 million people, most of them European Jews, perished between 1940 and 1945 in the Auschwitz-Birkenau camp before it was liberated by Soviet forces.