The Iraq-Niger Uranium Controversy and the Outing of CIA Agent Valerie Plame Wilson: British Support of Iraq-Niger Uranium ClaimsMarch 7, 2003-July 7, 2003: US and Britain Continue to Maintain They Have Evidence Iraq Was Trying to Buy Uranium from Niger; Evidence Based on Forged Documents
After the International Atomic Energy Agency (IAEA) reports that the Niger documents (see March 2000) are not authentic (see March 7, 2003), the US and British governments stand behind their claim that Iraq had sought uranium from an African country. The two countries maintain that they have additional evidence—from multiple sources—but do not elaborate. Pressed by journalists and inspectors to reveal their evidence, the two governments refuse. The IAEA tells Reuters that when it asked the US and Britain whether or not they have additional evidence that Iraq had tried to procure uranium, the answer was “no.” [Reuters, 3/26/2003]
snopes.com: Yellowcake Uranium Removed from Iraq
The yellowcake removed from Iraq in 2008 was material that had long since been identified, documented, and stored in sealed containers under the supervision of U.N. inspectors. It was not a "secret" cache that was recently "discovered" by the U.S, nor had the yellowcake been purchased by Iraq in the years immediately preceding the 2003 invasion. The uranium was the remnants of decades-old nuclear reactor projects that had put out of commission many years earlier: One reactor at Al Tuwaitha was bombed by Israel in 1981, and another was bombed and disabled during Operation Desert Storm in 1991. Moreover, the fact that the yellowcake had been in Iraq since before the 1991 Gulf War was plainly stated in the Associated Press article cited in the example above:
Tuwaitha and an adjacent research facility were well known for decades as the centerpiece of Saddam's nuclear efforts.
Israeli warplanes bombed a reactor project at the site in 1981. Later, U.N. inspectors documented and safeguarded the yellowcake, which had been stored in aging drums and containers since before the 1991 Gulf War. There was no evidence of any yellowcake dating from after 1991, the official said.