Compare these two interpretations of the Ahmadinejad letter. The first is from the New York Times:

The letter also included many standard views of conservatives in Iran, including the comment that those responsible for planning the attacks on Sept. 11, 2001, were never charged or tried, hinting darkly of conspiracy.
“Sept. 11 was not a simple operation,” he wrote. “Could it be planned and executed without coordination with intelligences and security services, or with extensive infiltration? Of course, this is just an educated guess. Why have the various aspects of the attacks been kept secret?”

Ahmadinejad clearly means to imply that the United States government was somehow involved in the murder of nearly 3,000 of its own citizens. What else could he be talking about?

Now look at how the AP reported on the same passage:

Ahmadinejad chastised the United States for opposing the Islamic revolution, backing Saddam Hussein during the Iran-Iraq war, and botching the investigation into the September 11 attacks.

Implying that the U.S. was involved = “botching the investigation.” The line comes near the end of the article, and it is not an unexpected finish to a story that begins:

UNITED NATIONS — With his 18-page letter, Iranian President Mahmoud Ahmadinejad delivered President Bush a history lesson, philosophy lecture and religious sermon laced with references to Jesus Christ.
The document gives rare insight into a man who has largely been a mystery to the West, showing him as fixated on a long list of grievances against the United States and seeking to build on a shared faith in God.

Quite a whitewash for the theologian of Tehran.