Most of the incident reports are marked “secret,” a relatively low level of classification. The Times has taken care not to publish information that would harm national security interests. The Times and the other news organizations agreed at the outset that we would not disclose — either in our articles or any of our online supplementary material — anything that was likely to put lives at risk or jeopardize military or antiterrorist operations. We have, for example, withheld any names of operatives in the field and informants cited in the reports. We have avoided anything that might compromise American or allied intelligence-gathering methods such as communications intercepts. We have not linked to the archives of raw material. At the request of the White House, The Times also urged WikiLeaks to withhold any harmful material from its Web site.

To establish confidence in the information, The Times checked a number of the reports against incidents that had been publicly reported or witnessed by our own journalists. Government officials did not dispute that the information was authentic.