Iranian officials denied a report that the country's parliament had passed a measure requiring Jews, Christians and other religious minorities to wear colored badges singling them out as non-Muslims.

According to a story published by the National Post of Canada, the new measure would have required Iran's estimated 25,000 Jews to wear a yellow strip of cloth on the front of their clothes. Christians would have had to wear red badges and Zoroastrians blue.

Metropolitan-area radio stations aired the report throughout the day, and media worldwide picked the story up.

Iran's conservative-dominated parliament is debating a draft law that would discourage women from wearing Western clothing, increase taxes on imported clothes and fund an advertising campaign to encourage citizens to wear Islamic-style garments.

In Tehran, legislator Emad Afroogh, who sponsored the bill and chairs the parliament's cultural committee, told The Associated Press there was no truth to the Canadian newspaper report, calling it "a sheer lie."

"The bill is not related to minorities. It is only about clothing," Afroogh said. "Please tell them [in the West] to check the details of the bill. There is no mention of religious minorities and their clothing in the bill."

Iranian Jewish lawmaker Morris Motamed told the AP: "Such a plan has never been proposed or discussed in parliament. Such news, which appeared abroad, is an insult to religious minorities here."

Last Friday, the National Post ran a story prominently on the front page alleging that the Iranian parliament had passed a law that, if enacted, would require Jews and other religious minorities in Iran to wear badges that would identify them as such in public. It is now clear the story is not true. Given the seriousness of the error, I felt it necessary to explain to our readers how this happened.

The story of the alleged badge law first came to us in the form of a column by Amir Taheri. Mr. Taheri, an Iranian author and journalist, has written widely on Iran for many major publications. In his column, Mr. Taheri wrote at length about the new law, the main purpose of which is to establish an appropriate dress code for Muslims. Mr. Taheri went on to say that under the law, "Religious minorities would have their own colour schemes. They will also have to wear special insignia, known as zonnar, to indicate their non-Islamic faith."

This extraordinary allegation caught our attention, of course. The idea that Iran might impose such a law did not seem out of the question given that its President has denied the Holocaust and threatened to "wipe Israel off the map." We tried to contact Mr. Taheri, but he was in transit and unreachable.

The editor who was dealing with Mr. Taheri's column wrote to Rabbi Abraham Cooper, associate dean of the Simon Wiesenthal Center in Los Angeles. The Wiesenthal Center is an international Jewish human rights organization that keeps a close watch on issues affecting the treatment of Jews around the world, and maintains contacts in many countries, including Iran. Asked about the specific allegation that Iran had passed a law requiring religious minorities to identify themselves, Rabbi Cooper replied by e-mail that the story was "absolutely true." When a reporter spoke to Rabbi Marvin Hier, dean of the Wiesenthal Center in Los Angeles, a short while later, Rabbi Hier said the story was true and added that the organization had sent a letter to UN Secretary-General Kofi Annan asking him to take up the matter. (Rabbi Hier has since said that, contrary to the understanding of the reporter, the Wiesenthal Center had not independently confirmed Mr. Taheri's allegation.)

The reporter also spoke with two Iranian exiles in Canada — Ali Behroozian in Toronto and Shahram Golestaneh in Ottawa. Both said that they had heard the story of the badges from their contacts in Iran and they believed it to be true.

Canada's Foreign Affairs Department did not respond to questions about the issue until after deadline, and then only to say they were looking into the matter. After several calls to the Iranian embassy in Ottawa, the reporter reached Hormoz Ghahremani, a spokesman for the embassy. Mr. Ghahremani's response to the allegation was that he did not answer such questions.

We now had four sources — Mr. Taheri, the Wiesenthal Center and two Iranian exiles in Canada — telling us that according to their sources the Iranian law appeared to include provisions for compelling religious minorities to identify themselves in public. Iranian authorities in Canada had not denied the story. Given the sources, and given the previous statements of the Iranian President, we felt confident the story was true and decided to publish it.

The reaction was immediate and distressing. Several experts whom the reporter had tried unsuccessfully to contact the day before called to say the story was not true. The Iranian embassy put out a statement late in the day doing what it had failed to do the day before — unequivocally deny such a law had been passed.

The reporter continued to try to determine whether there was any truth to the story. Some sources said there had been some peripheral discussion in the Iranian parliament of identifying clothing for minority religions, but it became clear that the dress code bill, which was introduced on May 14 and has not yet been passed into law, does not include such provisions.

Mr. Taheri, who had written the column that sparked the story, was again unreachable on Friday. He has since put out a statement saying the National Post and others "jumped the gun" in our characterization of his column. He says he was only saying the provisions affecting minorities might happen at some point. All of the people who read the column on the first day took it to mean the measure was part of a law that had been passed. Mr. Taheri maintains the zonnar, or badges, could still be put in effect when the dress code law is implemented.

On Saturday, the National Post ran another front-page story above the fold with the Iranian denial and the comments of the experts casting doubts on the original story.

It is corporate policy for all of CanWest's media holdings to face up to their mistakes in an honest, open fashion. It is also the right thing to do journalistically.

We acknowledge that on this story, we did not exercise sufficient caution and skepticism, and we did not check with enough sources. We should have pushed the sources we did have for more corroboration of the information they were giving us. That is not to say that we ignored basic journalistic practices or that we rushed this story into print with no thought as to the consequences. But given the seriousness of the allegations, more was required.

We apologize for the mistake and for the consternation it has caused not just National Post readers, but the broader public who read the story. We take this incident very seriously, and we are examining our procedures to try to ensure such an error does not happen again.