Stefan Meller, Poland's Foreign Minister, has ruled out allowing any Iranian researchers to examine the scale of the Holocaust committed by the German Nazis on Polish soil during World War II.

Meller's remarks came after repeated denials of the Jewish Holocaust by Iranian officials and their suggestions that more research is needed to establish the truth about what happened to European Jews.

"Under no circumstances we should allow something like that to take place in Poland," Meller told Polish news agency PAP on Friday. "It goes beyond all imaginable norms to question, even discuss or negotiate the issue."

Polish daily Rzeczpospolita reported on Friday that Iran wants to send researchers to Poland to examine the scale of the Nazi crimes during the war.

Some 6 million Jews perished in the Holocaust, with an estimated 1.1 million killed in gas chambers at Auschwitz- Birkenau, a death camp set up in German-occupied Poland.

Last week Iran's ambassador to Lisbon, who in the past served as a diplomat in Poland, said in an interview on Portuguese radio that according to his calculations based on a visit to the camp, now a museum, it would have taken the Nazis 15 years to burn the corpses of 6 million people.