Newly Released Intelligence Files Show Al-Qaeda Airplane Attack Warnings Preceded September 11

The Central Intelligence Agency has released seventy-one previously classified President’s Daily Briefs spanning from February 1998 through September 12, 2001, revealing that American intelligence officials warned President Clinton’s administration in 1998 that Osama bin Laden’s al-Qaeda terrorist organization might attempt to fly an explosive-laden aircraft into an American city.

This represents the agency’s largest public release of intelligence analysis related to the September 11 attacks. The documents provide an unprecedented window into what two successive administrations knew about the evolving threat from bin Laden and his network in the years preceding that terrible day.

A September 10, 1998 intelligence report titled “Bin Laden’s Location and Intentions” specifically warned that al-Qaeda “may fly an explosive-packed airplane into a U.S. city.” While intelligence officials did not possess the precise details of the eventual September 11 plot, including the specific targets, exact timing, or the coordinated use of multiple hijacked commercial aircraft, these newly public documents demonstrate that American intelligence agencies had repeatedly conveyed warnings that bin Laden sought to strike American targets.

The 1998 warning formed part of a disturbing pattern. In July of that year, President Clinton received a report stating that indications from multiple sources suggesting bin Laden intended to attack the United States were considered “plausible.” A 1999 assessment examined whether the substantial number of potential al-Qaeda targets being reported might represent an intentional deception campaign designed to overwhelm American intelligence capabilities.

By October 2000, intelligence officials informed the White House that bin Laden remained “committed to striking U.S. targets,” though the CIA acknowledged it could not determine specific locations or timing. On July 24, 2001, barely more than a month before the attacks, President George W. Bush received a report stating that an “expected imminent bin Laden-sponsored terrorist operation” had been postponed, while cautioning that preparations for other attacks could still be underway.

The documents also include the now-infamous August 6, 2001 presidential briefing titled “Bin Ladin Determined to Strike in US,” which had been previously released and warned that bin Laden had been preparing operations against the United States for years. The newly released material provides critical additional context, demonstrating that this warning was not an isolated alert but rather part of an extensive, ongoing series of intelligence assessments about al-Qaeda.

The CIA has stated that these documents illustrate the considerable difficulty intelligence officials faced in distinguishing meaningful warnings from incomplete, contradictory, and sometimes unreliable information. Before September 11, counterterrorism had not yet become the dominant intelligence priority it would necessarily become in the aftermath of those attacks.

Intelligence analysts possessed information indicating bin Laden’s desire to attack the United States, but they frequently lacked specific details about the location and timing of potential attacks. This release underscores a sobering reality: the intelligence community identified the threat and conveyed warnings to the highest levels of government, yet the nation’s defenses proved insufficient to prevent the catastrophic events of September 11, 2001.

The question that remains is not whether warnings were issued, but whether the warnings received the urgency and resources necessary to prevent what would become the deadliest terrorist attack on American soil.