Any American claims of "foreign terrorists" needs to be handled with great skepticism. This propaganda ploy is far easier than finding WMD, and less likely to cause an embarrassment - dead bodies don't talk.
As the fog of war lifts, the propaganda model followed by the United States to sell the US-Iraq War is now clear, and the best way to understand this campaign is to consider it as psychological warfare against the US population.
Will Iraq reemerge as an independent country or will it be torn asunder? The Kurds have been led to believe that they can expect something in the North. Why are British forces tearing down Iraqi flags?
As soon as a propaganda ploy has been exposed, the current media spinners will move to the next tall story. They seem to count on either the poor memory of the population, their general disinterest or their credulity.