Bush Ignored Spy Agencies’ Prewar Warnings of Iraq Perils

From The Washington Post:

Months before the invasion of Iraq, U.S. intelligence agencies predicted that it would be likely to spark violent sectarian divides and provide al-Qaeda with new opportunities in Iraq and Afghanistan, according to a report released yesterday by the Senate Select Committee on Intelligence. Analysts warned that war in Iraq also could provoke Iran to assert its regional influence and "probably would result in a surge of political Islam and increased funding for terrorist groups" in the Muslim world.

The intelligence assessments, made in January 2003 and widely circulated within the Bush administration before the war, said that establishing democracy in Iraq would be "a long, difficult and probably turbulent challenge." The assessments noted that Iraqi political culture was "largely bereft of the social underpinnings" to support democratic development.
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Also see an article about this in The New York Times.