The case is seen as unprecedented as Irmgard Furchner was a civilian worker at Stutthof.

She had worked as a typist in the office of Stutthof camp commandant Paul-Werner Hoppe, near the modern-day Polish city of Gdansk, which was then occupied by Nazi Germany and known as Danzig.

For two years before the end of the war in 1945, she was said to have known key details of what went on at the concentration camp.

During Hoppe's 1954 trial she revealed how he had dictated messages to her but claimed she knew nothing of the Nazi murders at Stutthof.

Some 100,000 people were held at Stutthof, which was notorious for atrocious conditions and 65,000 are estimated to have died.

Stutthof had gas chambers, and people were killed at the camp by gassing, shooting and lethal injection as well as death and starvation. More lost their lives on death marches from the camp as World War Two neared its end.

Those killed at Stutthof include many Jews as well as non-Jewish Poles and captured Soviet soldiers.

Thursday's case marks one of the last ever Nazi trials, largely because few defendants are still alive. The trial is taking place in a juvenile court as the defendant was under the adult age at the time.

In March, a former Stutthof camp guard was declared unfit to stand trial, while last year another camp guard, Bruno Dey, was found guilty of complicity in the murder of more than 5,000 prisoners. He was given a suspended jail term.

BBC