Days after receiving an 18-page letter from Iranian president Mahmoud Ahmadinejad, President George W. Bush called the lengthy missive "an act of war" and demanded that Iran halt its production of long letters at once.

At the White House, aides said that writing a letter of such length to President Bush, who is known for his extreme distaste for reading, was the most provocative act Mr. Ahmadinejad could have possibly committed.

"Everyone knows that the last book the president read was 'My Pet Goat,'" one aide said. "Expecting him to read an 18-page letter is really asking for it, and that Iranian dude must have known that."

According to those close to Mr. Bush, the president was infuriated upon receipt of the 18-page letter and asked aides if it was some kind of joke.

The president then demanded that the letter be boiled down to a one- or two-page format, or possibly adapted to a DVD version, just as he had ordered for news reports on Hurricane Katrina.

In Tehran, President Ahmadinejad said he was "taken aback" by Mr. Bush's refusal to read an 18-page letter, but said that all his future communications to the U.S. president would be in short, easy-to-read instant-messaging format.

In his first IM to President Bush, released to the press today, President Ahmadinejad writes, "Am building nukes. R U angry? LOL."

Elsewhere, Air Force Gen. Michael V. Hayden vowed today that as director of the CIA he would push the agency to find new and better sources of false intelligence.