Two-thirds of respondents stand by the conclusions of the 9/11 Commission, which blamed al-Qaeda for the attacks.

The online survey of a representative national sample of 1,007 Americans asked respondents to say whether they agreed or disagreed with a statement made by Ahmadinejad earlier this month.

Ahmadinejad stated on Mar. 6: “The Sept. 11 incident was a big fabrication as a pretext for the campaign against terrorism and a prelude for staging an invasion against Afghanistan.”

Respondents were shown the entire statement, but were not informed that the Iranian President himself had voiced those views. In all, 62 per cent of respondents disagree with the statement, 26 per cent of respondents agree with it, and 12 per cent are undecided.

Republicans (80%) are more likely to reject the statement than Independents (66%) or Democrats (55%).

The 9/11 Commission

In all, two-thirds of Americans (67%) agree with the commission that investigated the events of Sept. 11, 2001, which concluded that an attack was carried out by 19 hijackers who were members of the al-Qaeda terrorist organization, led by Osama bin Laden. Only 12 per cent of respondents reject the commission’s findings, and one-in-five Americans (21%) are undecided.

Four-in-five Republicans (80%) stand by the commission’s findings, while two-thirds of Democrats (66%) and Independents (65) concur.

Conspiracy Theories

The survey asked respondents whether four things that have been said and written about the events of 9/11 are actually credible. Just 15 per cent of respondents think the collapse of the World Trade Center was the result of a controlled demolition, and the same proportion believe that United Airlines Flight 93, which crashed in Pennsylvania, was shot down.

In addition, 13 per cent of respondents think no airplane actually crashed at the Pentagon on Sept. 11, and six per cent claim that no airplanes crashed into the World Trade Center at all.


A majority of Americans are on the same side when it comes to 9/11, stating that the event was not a fabrication, that the conclusions of the 9/11 commission are correct, and that the conspiracy theories are not credible.

While one-in-four Americans believe 9/11 was a fabrication designed to facilitate the campaign against terrorism, the proportion of respondents who openly reject the conclusions of the 9/11 commission—and who find the conspiracy theories as credible—is far lower.

Full Report, Detailed Tables and Methodology (PDF)


Mario Canseco, Vice President, Public Affairs
+604 647 3570