How to do it

Knight Ridder, which is still for sale:

WASHINGTON - U.S. intelligence agencies rpeatedly warned the White House beginning more than two years ago that the insurgency in Iraq had deep local roots, was likely to worsen and could lead to civil war, according to former senior intelligence officials who helped craft the reports.
Among the warnings, Knight Ridder has learned, was a major study, called a National Intelligence Estimate, completed in October 2003 that concluded that the insurgency was fueled by local conditions - not foreign terrorists- and drew strength from deep grievances, including the presence of U.S. troops.
The existence of the top-secret document, which was the subject of a bitter three-month debate among U.S. intelligence agencies, has not been previously disclosed to a wide public audience.

All here.