Following the invasion, no stockpiles of weapons of mass destruction were found, although about 500 abandoned chemical munitions, mostly degraded, remaining from Iraq's Iran–Iraq war, were collected from around the country. The Kelly Affair highlighted a possible attempt by the British government to cover-up fabrications in British intelligence, the exposure of which would have undermined the Prime Minister's original rationale for involvement in the war. The US Senate Select Committee on Intelligence found no substantial evidence for reputed links between Iraq and Al-Qaeda. President George W. Bush has since admitted that "much of the intelligence turned out to be wrong". Although evidence of weapons of mass destruction was searched for by the Iraq Survey Group, their final report of September 2004 stated, "While a small number of old, abandoned chemical munitions have been discovered, ISG judges that Iraq unilaterally destroyed its undeclared chemical weapons stockpile in 1991. There are no credible indications that Baghdad resumed production of chemical munitions thereafter, a policy ISG attributes to Baghdad's desire to see sanctions lifted, or rendered ineffectual, or its fear of force against it should weapons of mass destruction be discovered." In the March 2005 Addendum to the Report, the Special Advisor furthermore went on to state that "ISG assesses that Iraq and Coalition Forces will continue to discover small numbers of