According to the BBC, Al Queida is upset, because Iran is accusing Israel of committing 911 to get the Americans to invade Iraq and other places.
They did it, and they want credit for it.
The Onion, March 31:
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9/11 Conspiracy Theories ‘Ridiculous,’ Al Qaeda Says
You gotta be $#@$$ing me…Nostradamus had nothing on these guys.