The van contains fermenting vats like those used in the first stage of producing biological weapons. But they were washed down with a caustic cleaner, so there were no traces of biological material.
The U.S. still has not found any chemical or biological agents and some officials are starting to suggest there might not be any, just the equipment needed to manufacture them, reports CBS News Correspondent David Martin.
The latest pickup in the deck of 55 most wanted former Iraqi leaders could help. She is Huda Salih Mahdi Ammash, a microbiologist known to U.S. officials as "Mrs. Anthrax" for her suspected involvement in Iraq's biological weapons program.
In other developments:
With Ammash's detention, 19 of the most-wanted 55 Iraqis have been reported captured. She is the only woman on the most-wanted list.
Now she's claiming she wants to cooperate, but so far all the captured members of the top 55 are sticking to their story that Iraq has no weapons of mass destruction.
U.S. officials are counting on lower-ranking scientists and mountains of captured documents to reveal the truth.
"We're going to have to find people not at the very senior level who are vulnerable, obviously, if they're in custody, but it will be people down below who had been involved in one way or another," Defense Secretary Donald H. Rumsfeld said Sunday.
Asked if any of these lower-level officials are cooperating, Rumsfeld said: "Are they telling us something substantive? We don't have anything substantive to announce at the present time."
Along the way, officials say, investigators are coming across evidence Iraq was making large payments to movers and shakers in other countries- most notably France – in an effort to influence government policy. That's not necessarily illegal, but if true it should prove embarrassing.
U.S. intelligence officials said that Ammash, 49, is believed to have played a key role in rebuilding Baghdad's biological weapons capability since the first Persian Gulf War in 1991.
She was born in 1953 in Baghdad, and her father was Salih Magdi Ammash, a former vice president, defense minister and member of the Baath Party's leadership. Saddam Hussein reportedly ordered his execution in 1983.
In 2001, Ammash became the first and only woman elected to the highest policymaking body in the Baath Party, the regional command, after working closely with Saddam's youngest son, Qusai.
Ammash was trained by Nassir al-Hindawi, described by U.N. inspectors as the father of Iraq's biological weapons program, officials said.
She has served as president of Iraqi's microbiology society and as a dean at the University of Baghdad.
American officials say Ammash is among a new generation of leaders named by Saddam to leading posts within Iraq's Baath party. The Pentagon lists her as the party's Youth and Trade Bureau Chairman. She played a role in organizing Baath activities in Jordan, Lebanon and Yemen, officials said.
Ammash received her undergraduate degree at the University of Baghdad, master of science in microbiology from Texas Woman's University, in Denton, Texas, and received a doctorate in microbiology from the University of Missouri-Columbia in 1983.
In one of several videos of Saddam released during the war, Ammash was the only woman among about a half-dozen men seated around a table. The videos were used as Iraqi propaganda as invading forces drew closer to Baghdad, and it was not known when the meeting happened or what was the significance of her presence there.