The Pentagon's No. 2 official says that U.S. enemies already are mining data released this week in a trove of Iraq war documents for ways to harm the American military.
Deputy Defense Secretary William J. Lynn called the documents "stolen material" and said they give adversaries key insight on how the U.S. military operates.
He did not say which groups, or how the Pentagon knew they were researching the documents.
The Pentagon furiously opposed the documents' release this week by the whistle-blower WikiLeaks website.
Tuesday's remarks to reporters in Baghdad came a day after WikiLeaks founder Julian Assange told CNN that the nearly 400,000 papers did not put troops at risk because the names of any soldiers or Iraqi civilians have been redacted.