A child rides by the head of the Saddam Hussein monument taken down from Paradise Square in Baghdad in April 2003. | View larger image

WASHINGTON — An exhaustive review of more than 600,000 Iraqi documents that were captured after the 2003 U.S. invasion has found no evidence that Saddam Hussein's regime had any operational links with Osama bin Laden's al Qaida terrorist network.

The new study of the Iraqi regime's archives found no documents indicating a "direct operational link" between Hussein's Iraq and al Qaida before the invasion, according to a U.S. official familiar with the report.

He and others spoke to McClatchy on condition of anonymity because the study isn't due to be shared with Congress and released before Wednesday.

Then-Defense Secretary Donald H. Rumsfeld claimed in September 2002 that the United States had "bulletproof" evidence of cooperation between the radical Islamist terror group and Saddam's secular dictatorship.