Iran's controversial "World Holocaust Foundation" is calling for European nations to supply documents proving that the mass slaughter of Jews occurred during the Holocaust.

Iranian President Mahmoud Ahmadinejad called for the creation of the foundation after holding a controversial conference questioning the truth about the Holocaust in Tehran last December. The conference sparked international outrage.

The head of the state-sponsored group, Mohammed Ali Ramin, said that Austria, Germany and Poland in particular should come up with documents, reported the AFP.

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"They should hand over the proof for the dossier on the organized massacre of Jews in Europe during World War II to the independent international fact-finding committee affiliated to this foundation," the IRNA state news agency quoted Ramin as saying.

Ahmadinejad has made multiple controversial comments, including describing the mass killing of 6 million Jews in World War II as a "myth" and also called for Israel to be "wiped from the map".

Most historians say there is ample documentary proof that around 6 million Jews were killed by the Nazis in World War II, although different estimates put the figure slightly higher or lower.