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WASHINGTON — No U.S. intelligence sources or practices were compromised by the posting of secret Afghan war logs by the WikiLeaks website, the Pentagon has concluded, but the military thinks the leaks could still cause significant damage to U.S. security interests.
The assessment, outlined in a letter obtained Friday by The Associated Press, suggests that some of the Obama administration's worst fears about the July disclosure of almost 77,000 secret U.S. war reports have so far failed to materialize.
Defense Secretary Robert Gates reported these conclusions in an Aug. 16 letter to Sen. Carl Levin, chairman of the Senate Armed Services Committee, who had requested a Pentagon assessment.
WikiLeaks, a self-described whistle-blower website, is believed to be preparing to release an even larger set of classified Pentagon documents on the Iraq war as early as Sunday.
U.S. officials warned of dire consequences in the days following the July leak. In his letter to Levin, Gates struck a more measured tone in describing the impact.
"Our initial review indicates most of the information contained in these documents relates to tactical military operations," Gates wrote, suggesting the materials did not include the most sensitive kinds of information.
"The initial assessment in no way discounts the risk to national security; however, the review to date has not revealed any sensitive intelligence sources and methods compromised by this disclosure," he added.
A Pentagon spokesman, Marine Col. David Lapan, said Friday that the assessment of the July documents is still valid, even after a more thorough review. A special task force led by the Defense Intelligence Agency combed the posted reports for weeks to determine what might have been compromised.
Names of intelligence sources generally are classified at a higher level than the secret-level documents published by WikiLeaks. The documents provided a ground-level view of the war, from 2004 through 2009, based largely on narrow intelligence reports and other battlefield materials.
Gates noted that the documents contained the names of "cooperative Afghan nationals." These were not secret intelligence sources but Afghans who had decided to cut their ties to the Taliban.
The Taliban later vowed to punish these individuals, if the reports proved true.
"We assess this risk as likely to cause significant harm or damage to the national security interests of the United States and are examining mitigation options," Gates wrote. "We are working closely with our allies to determine what risks our mission partners may face as a result of the disclosure."
So far, the Pentagon has not reported any incidents of reprisals against Afghans named in the leaked documents.
Gates told a news conference on July 29, just a few days after the documents were posted by WikiLeaks, that he had enlisted the help of the FBI to investigate a leak with "potentially dramatic and grievously harmful consequences."
"The battlefield consequences of the release of these documents are potentially severe and dangerous for our troops, our allies and Afghan partners, and may well damage our relationships and reputation in that key part of the world," he said. "Intelligence sources and methods, as well as military tactics, techniques and procedures, will become known to our adversaries."
At the same news conference, Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, said the WikiLeaks operators could face blame for any deadly consequences.
"The truth is, they might already have on their hands the blood of some young soldier or that of an Afghan family," Mullen said.
More recently, U.S. intelligence officials have said the July disclosures sharpened a debate over how far to go in sharing sensitive information within the government, a practice that expanded after Sept. 11, 2001, in order to help prevent future terrorist attacks.
In a speech Oct. 6 to the Bipartisan Policy Center, the director of national intelligence, James Clapper, called the July leaks "a big yellow flag" for those concerned about protecting classified information.
"I think it's going to have a very chilling effect on the need to share," Clapper said.
Military investigators say Army Pfc. Bradley Manning, who served as an intelligence specialist in Baghdad, is a person of interest in the investigation into who provided the Afghan war logs to WikiLeaks.