What did US intelligence know before the 9/11 attacks?

US Intelligence Documents Detail Pre-9/11 Tracking of bin Laden and al-Qaeda

Twenty-five years after the September 11 attacks, the CIA has released presidential daily briefs that record what senior United States officials received about Osama bin Laden and al-Qaeda in the period leading up to the hijackings that killed nearly 3,000 people. CIA Director John Ratcliffe described the release as an act of exceptional transparency. It constitutes the agency’s largest disclosure to date of these classified summaries prepared for the president and top government officials.

The documents span February 1998 through September 12, 2001. They record CIA tracking of bin Laden’s movements, financing, and networks inside and outside the United States. One 1998 brief warned that the group responsible for the East Africa embassy bombings “may fly an explosive-packed airplane into a US city.” Another noted that members of bin Laden’s network had received hijack training. Additional entries described efforts to obtain materials for a radiological dispersal device.

The files add limited new operational detail on the planning of the September 11 attacks themselves but provide a chronological record of the intelligence reporting that reached senior officials. Many pages remain redacted to protect sources and methods.

Scope of the Release

The CIA made available 71 presidential daily briefs covering February 1998 to September 2001. The earliest document, dated February 13, 1998, is titled “Terrorists seeking WMD capability.” The final entry, “Situation Report: Bin Laden’s Tracks,” is dated September 12, 2001. The collection totals 101 pages and includes reporting on the Taliban’s refusal to surrender bin Laden, his pursuit of chemical, biological, and radiological weapons, his financial networks, and repeated indications of intent to attack inside the United States.

Content of the Briefings

The briefs show that analysts followed bin Laden’s location, the support structure around him, his operatives inside the United States, and the sources of his funding. Several entries contained specific language. A September 1998 brief stated that bin Laden’s “preferred option is to strike the US on its own soil in Washington.” By June 1999, reporting described experiments with explosives intended to increase energy output in connection with radiological devices. An April 1998 brief assessed that the Taliban viewed bin Laden as a guest and remained reluctant to restrict his activities because of gratitude for his role during the Soviet-Afghan war from 1979 to 1989.

Frequency and Specificity of Warnings

Reporting on bin Laden appeared regularly in 1998, 1999, and 2000. Titles included “Terrorism: Bin Laden Extremists Planning Attacks.” After the January 2001 change in administration, the volume of such items increased. By summer 2001, the language grew more direct, including the August 6, 2001, brief titled “Bin Ladin Determined To Strike in US.”

Aircraft as a Potential Weapon

References to aircraft appeared as early as 1998. A September 10, 1998, brief recorded bin Laden’s preference for striking Washington and added that the group behind the East Africa bombings “may fly an explosive-packed airplane into a US city.” The same document stated that intelligence provided “no conclusive information” on specific future targets. A December 4, 1998, brief titled “Bin Laden Preparing To Hijack US Aircraft and Other Attacks” reported that conspirators had conducted a trial run at an unidentified New York airport and that some network members had received hijack training.

Limitations of the Intelligence

The released material does not contain evidence that officials possessed advance knowledge of the September 11 plot’s timing, method, or targets. It shows that agencies held multiple pieces of information but did not connect them into a single actionable warning before the attacks occurred. No documents in the release support claims of government foreknowledge or involvement in the attacks.

Prior Public Availability

Some of the documents had been released earlier. The August 6, 2001, brief was declassified in 2004 at the request of the 9/11 Commission. The commission’s final report already summarized the broader pattern: US intelligence had tracked bin Laden’s statements and activities for years, aircraft appeared in some reporting, and no single document identified the precise date, location, or operational details of the eventual attacks. The current release supplies the original wording of the briefs rather than summaries prepared for the commission.

The documents therefore supply additional primary-source context for the intelligence picture that existed before September 11, 2001, while confirming the absence of any documented foreknowledge of the specific operation that took place.