Like the rest of his crazy statements, this one is calculated for effect in Iran. Doesn’t make it any less nuts, though.
From the link:
Perhaps concerned that his repeated suggestions that the Holocaust might not have happened have become less shocking over time, Iran’s president, Mahmoud Ahmadinejad upped the ante on Saturday, telling intelligence officials in Tehran that the destruction of the World Trade Center on September 11, 2001 was staged.
In remarks reported by IRNA, an official Iranian news agency, and translated by Reuters, Mr. Ahmadinejad said, “The September 11 incident was a big fabrication as a pretext for the campaign against terrorism and a prelude for staging an invasion against Afghanistan.” Mr. Ahmadinejad also reportedly described the attacks in New York as a “complicated intelligence scenario and act.” Conspiracy theorists in the Middle East have suggested that the attacks were not the work of Al Qaeda, but carried out by Israeli or American intelligence operatives.