Mr. Schmitz later confronted Mr. Daisey, and according to a transcript posted online, asked the stage performer about the workers he said were poisoned by the toxic chemical known as N-hexane.

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He said pressure on the Assad regime has been an obstacle to a fair U.N. investigation of the use of chemical weapons.

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The United States and Britain accused Iraq of failing to comply with U.N. resolutions demanding it give up chemical and biological weapons, long-range missiles and any nuclear weapons program.

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They looked specifically at a chemical called alpha 1, 4-N-acetylglucosamine.

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U.N. officials revealed in October that Iraq may still have chemical caches, despite four years of anytime-anywhere inspections.

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"We destroyed a lot of chemical weapons, " says Duelfer of the U.N. inspection team.

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The United States and its allies invaded Iraq in March 2003, accusing Saddam Hussein's regime of concealing stocks of chemical and biological weapons, long-range missiles and efforts to develop a nuclear bomb from U.N. weapons inspectors.

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