" Bush administration officials told Fox News that mustard gas (search) was also recently discovered."
" Two weeks ago, U.S. military units discovered mustard gas that was used as part of an IED. Tests conducted by the Iraqi Survey Group (search) and others concluded the mustard gas was "stored improperly," which made the gas "ineffective."
They believe the mustard gas shell may have been one of 550 for which former Iraqi President Saddam Hussein failed to account when he made his weapons declaration shortly before Operation Iraqi Freedom began last year. "
http://www.foxnews.com/story/0,2933,120137,00.html