In the run up to the 2003 Invasion of Iraq, the main rationale for the Iraq War was Hussein's Iraq failure to transparently and verifiably cease Weapons of Mass Destruction (WMD - nuclear, biological and chemical weapons) programs, and to destroy all materials relating thereto, as mandated in United Nations Resolution 1441. In February 2003 the then Secretary of State Colin Powell gave a presentation before the United Nations showing a computer generated view of what the laboratories looked like. He said Iraq had as many as 18 mobile facilities for making anthrax and botulinum toxin. "They can produce enough dry, biological agent in a single month to kill thousands upon thousands of people." Powell based the assertion on accounts of at least four Iraqi defectors, including a chemical engineer who supervised one of the facilities and been present during production runs of a biological agent.