Thanks, A.A. Cunningham. I hadn't seen the Die Welt report before. I did, just now, find this denial by Sudan of the report you cite (and it comes from Albawaba, so you know it must be true!):
Sudan denies report Syria tested chemical weapons on people in Darfur
17-09-2004
http://www.albawaba.com/news/index.php3?sid=285127&lang=e&dir=news
Sudan has denied a recent report published by Die Welt, a German newspaper, claiming that "Syria tested chemical weapons on the Darfur public in the western part of Sudan, causing the deaths of tens of thousands of people."
A statement from the Sudanese Embassy in Ankara reported no military cooperation or accord between Damascus and Khartoum. It also cited that no such accusations have been made by the international groups currently at work in Darfur. The statement asked, "Where are the corpses of tens of thousands of people who are claimed to have been killed?"
The statement declared that Sudan possessed no chemical weapons. Additionally, it recalled the 1998 US strike against the Sifa Drug Company, suspected by the US government of manufacturing chemical weapons, and said that the US claim was "baseless."
The German newspaper said that its story was based on intelligence reports from European states. The Sudanese government believes that such disinformation is part of a US - Israeli campaign to undermine Syria's international influence. (albawaba.com)
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What I find odd is that the IMRA/Middle East Newsline piece sources the report to the CIA, which has not exactly been friendly to the President's Iraq policy. Also, though IMRA/MENL say US officials have released this info, I don't find it elsewhere on the web. Both IMRA and MENL are reliable sources, but it'd be nice -- actually, it'd be extremely nice -- to see this report in other media, and with attribution to somebody identifiable in Washington.