The Swiss Federal Intelligence Service has said it will finally open long-sealed files on the notorious Nazi war criminal Josef Mengele, but without indicating when.

Mengele fled Europe after World War II, but for years rumors have suggested that he spent time in Switzerland, even while an international warrant was out for his arrest.

Historians have repeatedly requested access to the files, but until now, Swiss authorities have refused.

Mengele, known as the Angel of Death, served in the Waffen SS and was posted to the Auschwitz extermination camp, where he was responsible for sending countless victims to their deaths.

After the war, Mengele assumed a false identity and a Red Cross travel document obtained from the Swiss consulate enabled him to escape to South America.

The documents in question were sealed on national security grounds, and although some historians believe they may contain minimal information directly about Mengele, others urge the need for full transparency in this historical examination.

Swiss historian Regula Bochsler, who has long investigated Mengele's potential presence in the country following the war, emphasized that historical records about his whereabouts after the war are crucial for uncovering the truth about Switzerland's role during this dark chapter in history.