Taken from Fox's news;

Meanwhile, a dozen suspicious 55-gallon drums were found propped up with gravel in an open field near the northern Iraqi town of Baiji. Preliminary tests performed at the scene indicated one drum might contain the nerve agent cyclosarin and a blister agent that could be mustard gas, U.S. troops said.

But more tests were being conducted. By design, initial test procedures favor positive readings, erring on the side of caution to protect soldiers.

The New York Times quoted Capt. Ryan Cutchin of Mobile Exploitation Team Bravo -- one of the specialist teams deployed in Iraq -- as saying further testing by his unit had shown that the barrel's contents were not chemical weapons. He also said that initial suspicions that two vehicles at the site were mobile chemical laboratories had proved wrong.

There was no immediate comment from U.S. Central Command in Doha, Qatar, about the report, posted on the Times Web site Sunday.

There have been numerous false reports that coalition forces have turned up chemical or biological weapons. Since the discovery, Central Command has been measured in its response.

"There are many sites that we look into every day, and when we have confirmed positive results we will provide that information," spokesman Capt. Stewart Upton said earlier Sunday. "We just want to be very cautious that when we go with the information, that when we release nuclear, biological, or chemical information, that we're accurate."

Mustard gas burns skin, eyes and lungs, while exposure to high amounts cyclosarin may lead to loss of muscle control, twitching, paralysis, unconsciousness, convulsions, coma, and death within minutes.

Lt. Col. Ted Martin of the 10th Cavalry Regiment said soldiers went to the site near Baiji at midnight Friday after being alerted by U.S. Special Forces teams who became suspicions of the site because of the presence of surface-to-air missiles guarding the area.