Terrorists

WASHINGTON (CNN) -- The federal government has asked the National Academy of Sciences not to publish a research paper that feds describe as a "road map for terrorists" on how to contaminate the nation's milk supply.

The research paper on biological terrorism, by Stanford University professor Lawrence M. Wein and graduate student Yifan Liu, provides details on how terrorists might attack the milk supply and offers suggestions on how to safeguard it.

The paper appeared briefly May 30 on a password-protected area of the National Academy of Science's Web site.

Journalists use that area of the Web site to get advance copies of articles slated for publication in the Proceedings of the National Academy of Sciences.

People who downloaded the Wein-Liu paper called the Food and Drug Administration for comment, and the FDA notified the Department of Health and Human Services, which asked the academy to stop the article's publication.

The paper "is a road map for terrorists and publication is not in the interests of the United States," HHS Assistant Secretary Stewart Simonson wrote in a letter to the science academy chief Dr. Bruce Alberts.

The paper gives "very detailed information on vulnerability nodes" in the milk supply chain and "includes ... very precise information on the dosage of botulinum toxin needed to contaminate the milk supply to kill or injure large numbers of people," Simonson wrote.

"It seems clear on its face that publication of this manuscript could have very serious public health and national security consequences."

Simonson wrote that acting FDA Commissioner Dr. Lester Crawford was joining him in the request to halt publication.

Officials of HHS and the academy said they are to meet Tuesday to discuss the article.

"The academy has been dealing with the issue of scientific openness versus national security since 9/11," said academy spokesman Bill Kearney.

"The academy [members] are strong advocates of scientific openness while ensuring that nothing is done to aid terrorists."

Kearney said the NAS routinely vets papers for security concerns before publishing them and had vetted the Wein-Liu