When the Pentagon's internal think tank decided in 2004 it needed a better understanding of Al Qaeda, it turned to an unlikely source: the terrorism analyst Laurie Mylroie, who was known as the chief purveyor of the discredited idea that Saddam Hussein was behind Sept. 11 and many other attacks carried out by Al Qaeda.

Mylroie was paid roughly $75,000 to produce a 300-page study, "The History of Al Qaida," for the Defense Department think tank, known as the Office of Net Assessment, a DOD spokesman tells us.

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