Actually the report you just linked to has not been confirmed either. Rumsfield said that the AFP report was too early to be sure of anything.

http://www.foxnews.com/story/0,2933,83449,00.html

The exact quote is as follows.

"Agence France-Presse reported that the substances had turned out to be pesticides, but Rumsfeld said it could take several_days to get a positive identification of the chemicals."

For the record, the AGP is just as biased as some claim Fox news is.