Saudi Arabia's Connection to 9/11

Overview

Of the nineteen hijackers who carried out the September 11, 2001, attacks, fifteen were citizens of Saudi Arabia. This basic demographic fact has anchored more than two decades of investigation, litigation, and public debate about whether elements of the Saudi government provided material support to the attackers. The question is not whether individual Saudis were involved — that is established fact — but whether their actions reflected official policy, institutional support, or the operations of Saudi intelligence.

Three major investigative threads have sustained this inquiry: the classified “28 pages” of the 2002 Joint Congressional Inquiry, which were not declassified until 2016; the FBI’s long-running Operation Encore investigation into Saudi support networks; and civil litigation by families of 9/11 victims against the Kingdom of Saudi Arabia, which has produced thousands of pages of previously classified documents through court-ordered discovery and FOIA releases. Together, these sources have revealed a pattern of contacts between Saudi government officials and the hijackers that investigators describe as too extensive and too consistent to be coincidental, but that have not yet produced a definitive conclusion about the Saudi government’s institutional knowledge or intent.

Saudi Arabia has consistently denied any institutional involvement in the attacks, and the 9/11 Commission’s final report stated that it found “no evidence that the Saudi government as an institution or senior Saudi officials individually funded the organization.” However, this language was carefully crafted, and commissioners and staff have subsequently acknowledged that the question was not fully resolved. The distinction between the Saudi government “as an institution” and individual officials acting within Saudi governmental and intelligence structures remains at the heart of the ongoing debate.

Origins & History

The Saudi connection to the 9/11 attacks drew scrutiny almost immediately. Within weeks of September 11, investigators noted the disproportionate representation of Saudi nationals among the hijackers and began examining a web of Saudi contacts in the United States, particularly in San Diego, California, where two of the hijackers — Nawaf al-Hazmi and Khalid al-Mihdhar — had lived for approximately eighteen months before the attacks.

The first major investigative milestone was the Joint Inquiry conducted by the Senate and House Intelligence Committees in 2002, chaired by Senator Bob Graham of Florida and Representative Porter Goss. The inquiry produced an 832-page report, but 28 pages addressing Saudi connections were classified at the direction of President George W. Bush on grounds of national security. Senator Graham, who had seen the classified material, became a persistent public advocate for their release, stating repeatedly that the pages contained evidence of Saudi government support for the hijackers and that their classification served to protect a foreign government rather than legitimate national security interests.

The FBI’s interest in Saudi support networks predated the Joint Inquiry. Field agents in San Diego had identified Omar al-Bayoumi, a Saudi national who provided extensive logistical assistance to al-Hazmi and al-Mihdhar, as a person of significant interest. Al-Bayoumi had helped the two future hijackers find an apartment, co-signed their lease, assisted them in opening bank accounts, and connected them with other members of the local Muslim community. The investigation into al-Bayoumi and his network became known internally as Operation Encore.

The 9/11 Commission, established in late 2002, examined the Saudi question but gave it limited treatment in its final report. Staff who worked on the Saudi portfolio later indicated that the topic was politically sensitive and that the commission did not have the time or resources to resolve it. The commission’s carefully worded finding — that there was no evidence the Saudi government “as an institution” funded the attacks — left open the possibility that individual Saudi officials, operating within government structures, had provided support.

The issue was reignited in 2016 when Congress passed the Justice Against Sponsors of Terrorism Act (JASTA) over President Obama’s veto, allowing 9/11 families to sue Saudi Arabia in U.S. courts. That same year, the 28 pages were finally declassified. The combination of the JASTA litigation and FOIA releases driven by a 2021 executive order from President Biden has produced the most significant body of evidence to date regarding Saudi connections.

Key Claims

The central claims regarding Saudi Arabia’s connection to the 9/11 attacks include:

• Saudi intelligence operatives assisted the hijackers: Omar al-Bayoumi, identified by the FBI as a likely Saudi intelligence agent, provided direct logistical support to two hijackers in San Diego. His financial support from Saudi government-linked entities increased during the period he was assisting them.

• A support network existed: Al-Bayoumi was not acting alone. Fahad al-Thumairy, a Saudi diplomat and imam at the King Fahad Mosque in Los Angeles, was also in contact with the hijackers. Other Saudi nationals in San Diego, some with government connections, provided various forms of assistance.

• Financial links to the Saudi royal family: Checks from Princess Haifa bint Faisal, wife of Saudi Ambassador Prince Bandar bin Sultan, were traced through intermediaries to individuals who provided support to two of the hijackers. The Saudi government has characterized these payments as charitable donations unrelated to the attacks.

• The U.S. government protected Saudi Arabia from scrutiny: Critics allege that the classification of the 28 pages, the constraints placed on the 9/11 Commission’s investigation of the Saudi question, and the slow-rolling of Operation Encore all served to shield Saudi Arabia from accountability due to the U.S.-Saudi strategic and economic relationship.

• Operation Encore was suppressed: FBI field agents working Operation Encore believed they had developed significant evidence of a Saudi support network but that the investigation was constrained by officials at higher levels, allegedly due to diplomatic sensitivity.

• The “third tranche” of evidence: Declassified FBI documents reference a third group of Saudi nationals who had contact with the hijackers beyond al-Bayoumi and al-Thumairy, suggesting the support network was broader than publicly acknowledged.

Evidence

The evidence in this case is unusually extensive for an “unresolved” theory, consisting of government documents, congressional testimony, court filings, and declassified intelligence materials.

The 28 Pages: Declassified in July 2016, these pages from the Joint Congressional Inquiry describe contacts between Saudi government officials and two of the hijackers in San Diego. They detail financial transactions, phone records, and FBI investigative summaries suggesting a pattern of Saudi government-linked support. The pages name Omar al-Bayoumi and Fahad al-Thumairy and describe their connections to Saudi government and intelligence entities.

Omar al-Bayoumi: FBI documents released through JASTA litigation establish that al-Bayoumi was employed by a Saudi government contractor and received monthly payments that increased substantially during the period he assisted the hijackers. Phone records show he was in frequent contact with Saudi government offices. An FBI agent’s declaration filed in the JASTA case stated that the bureau had concluded al-Bayoumi was “tasked” by Saudi intelligence to assist the hijackers, though higher-level officials have not endorsed this characterization in official findings.

Fahad al-Thumairy: A Saudi Ministry of Islamic Affairs official serving as an imam in Los Angeles, al-Thumairy was in phone contact with al-Bayoumi around the time al-Bayoumi first met the hijackers. He was later denied re-entry to the United States due to suspected terrorist associations. Declassified documents indicate the FBI believed he was “aware of the hijackers’ presence and may have played a role in their support network.”

Financial traces: Investigators traced payments from Princess Haifa bint Faisal, through a Saudi family in San Diego, to individuals who had direct contact with the hijackers. While the Saudi government has described these as routine charitable contributions, investigators noted the coincidence of timing and the specific individuals through whom the funds flowed.

FBI internal assessments: Documents released in 2021 and 2022 include internal FBI memoranda and case summaries from Operation Encore. These documents show that field agents developed what they considered substantial evidence of a Saudi support network but expressed frustration at the pace and scope of the investigation’s progress through official channels.

Senator Bob Graham’s statements: As co-chair of the Joint Inquiry and a consumer of classified intelligence throughout the investigation, Graham has stated publicly and in his 2004 book “Intelligence Matters” that the evidence of Saudi government support for the hijackers was persuasive and that its concealment represented a significant failure of transparency.

Debunking / Verification

Saudi Arabia’s position: The Kingdom of Saudi Arabia has consistently denied any institutional involvement in the 9/11 attacks. Saudi officials have noted that the kingdom was itself a target of al-Qaeda, that Osama bin Laden had been stripped of his Saudi citizenship in 1994, and that Saudi Arabia cooperated with U.S. counterterrorism efforts after the attacks. The Saudi government welcomed the declassification of the 28 pages, stating the material would demonstrate the absence of institutional involvement.

The 9/11 Commission’s finding: The commission stated it found “no evidence that the Saudi government as an institution or senior Saudi officials individually funded” al-Qaeda. Supporters of the commission’s work argue that the investigation examined the Saudi question and concluded that individual contacts between Saudi nationals and the hijackers did not constitute evidence of an institutional conspiracy.

Alternative explanations: Some analysts have argued that the contacts between Saudi officials and the hijackers reflected the normal operations of Saudi religious outreach and charitable activity, which were extensive in the United States during this period and were not specifically targeted at the future hijackers. The assistance provided by al-Bayoumi, on this interpretation, was the product of cultural hospitality and community networking rather than an intelligence operation.

Why it remains unresolved: Despite the volume of evidence suggesting Saudi connections, no U.S. government body has issued a definitive finding of Saudi institutional complicity. The 28 pages, while suggestive, are described as “leads” rather than conclusions. Operation Encore has not resulted in public findings of Saudi government responsibility. The JASTA litigation continues but has not reached a final adjudication. The fundamental question — whether contacts between Saudi officials and the hijackers were coincidental, the product of individual radicalization within Saudi government ranks, or evidence of institutional support — has not been definitively answered by the available evidence.

Cultural Impact

The Saudi-9/11 connection has had substantial effects on U.S.-Saudi relations, American foreign policy discourse, and public understanding of the September 11 attacks.

The passage of JASTA in 2016, overriding President Obama’s veto with the largest veto override of his presidency, reflected bipartisan congressional sentiment that Saudi Arabia had not been held sufficiently accountable. The legislation marked a significant departure from traditional sovereign immunity protections and established a precedent for litigation against foreign governments in U.S. courts for alleged support of terrorism.

The issue has complicated the U.S.-Saudi relationship during multiple administrations. The Bush administration’s resistance to investigating Saudi connections was criticized by members of both parties. The Obama administration initially opposed declassification of the 28 pages before relenting. The Trump administration faced criticism for its close relationship with Saudi Crown Prince Mohammed bin Salman while JASTA litigation proceeded. The Biden administration’s 2021 executive order directing a review and declassification of Saudi-related 9/11 documents was seen as a significant shift.

The story has also become a touchstone in debates about government transparency and the use of classification to protect diplomatic relationships rather than genuine national security interests. Senator Graham’s persistent advocacy for declassification, spanning more than a decade, became a case study in the tension between secrecy and accountability.

For the families of 9/11 victims, the Saudi question represents an ongoing search for complete accountability. The JASTA litigation has provided a mechanism for obtaining documents that might otherwise have remained classified, and the families’ legal efforts have been the primary driver of new information entering the public domain.

Key Figures

Omar al-Bayoumi — Saudi national in San Diego who provided extensive logistical assistance to hijackers al-Hazmi and al-Mihdhar. Employed by a Saudi government contractor, he was identified by FBI agents as a likely Saudi intelligence operative.

Fahad al-Thumairy — Saudi diplomat and imam at the King Fahad Mosque in Los Angeles. In contact with al-Bayoumi around the time the hijackers arrived in Southern California. Later denied re-entry to the United States.

Prince Bandar bin Sultan — Saudi Ambassador to the United States from 1983 to 2005. His wife, Princess Haifa, wrote checks that were traced through intermediaries to individuals connected to the hijackers. Known for his close relationships with successive U.S. presidents.

Senator Bob Graham — Co-chair of the Joint Congressional Inquiry and the most prominent public advocate for investigation of Saudi connections. His sustained campaign for declassification of the 28 pages lasted from 2002 to 2016.

Nawaf al-Hazmi and Khalid al-Mihdhar — Two of the hijackers who lived in San Diego for approximately 18 months before the attacks. Their contacts with al-Bayoumi, al-Thumairy, and other Saudi nationals form the core of the evidentiary record.

Richard Lambert — Former FBI special agent in charge of the San Diego field office. Submitted a sworn declaration in the JASTA case stating that the FBI had developed evidence of a Saudi support network and that the investigation had been constrained.

Timeline

• January 2000 — Hijackers Nawaf al-Hazmi and Khalid al-Mihdhar arrive in Los Angeles. They meet Omar al-Bayoumi at a restaurant shortly after arrival.
• February 2000 — Al-Bayoumi helps al-Hazmi and al-Mihdhar find an apartment in San Diego, co-signs their lease, and assists with bank accounts.
• 2000–2001 — Al-Bayoumi’s monthly payments from a Saudi government contractor increase during the period of his contact with the hijackers.
• September 11, 2001 — Fifteen of the nineteen hijackers are Saudi citizens. Al-Hazmi and al-Mihdhar are among the five hijackers on American Airlines Flight 77.
• Late 2001 — FBI begins intensive investigation of Saudi support networks in San Diego, which becomes Operation Encore.
• 2002 — Joint Congressional Inquiry completes its report. Twenty-eight pages addressing Saudi connections are classified by President Bush.
• 2002–2003 — Senator Graham begins public campaign for declassification of the 28 pages.
• July 2004 — 9/11 Commission Report released, stating no evidence of Saudi institutional funding of al-Qaeda but acknowledging unresolved questions.
• 2004 — Senator Graham publishes “Intelligence Matters,” discussing Saudi connections in the strongest terms permitted by classification rules.
• 2011 — New leads in Operation Encore emerge. FBI continues investigation.
• September 2016 — Congress passes JASTA over President Obama’s veto, enabling 9/11 families to sue Saudi Arabia.
• July 2016 — The 28 pages are declassified and released publicly.
• 2017–present — JASTA litigation proceeds in federal court. Discovery produces thousands of pages of previously classified documents.
• September 2021 — President Biden signs executive order directing review and declassification of Saudi-related 9/11 documents.
• 2021–2023 — Multiple tranches of FBI documents related to Operation Encore are declassified and released.
• 2024–2026 — JASTA litigation continues. Additional documents enter the public record through court-ordered releases.

Sources & Further Reading

• Joint Inquiry into Intelligence Community Activities Before and After the Terrorist Attacks of September 11, 2001. “Part Four: Finding, Discussion and Narrative Regarding Certain Sensitive National Security Matters” (the “28 Pages”). Declassified July 2016.
• Graham, Bob, with Jeff Nussbaum. Intelligence Matters: The CIA, the FBI, Saudi Arabia, and the Failure of America’s War on Terror. Random House, 2004.
• Windrem, Robert. “New Questions on Saudi Ties to 9/11 Hijackers.” NBC News, multiple reporting entries, 2016–2022.
• National Commission on Terrorist Attacks Upon the United States. The 9/11 Commission Report. W.W. Norton & Company, 2004. Chapter 5: “Al-Qaeda Aims at the American Homeland.”
• FBI Operation Encore documents. Released pursuant to Executive Order 14040, September 2021, and subsequent FOIA releases.
• Summers, Anthony, and Robbyn Swan. The Eleventh Day: The Full Story of 9/11 and Osama bin Laden. Ballantine Books, 2011.
• JASTA litigation filings: In re Terrorist Attacks on September 11, 2001, U.S. District Court, Southern District of New York.
• Mazzetti, Mark. “Saudi Arabia: Friend or Foe in the War on Terror?” New York Times, multiple investigative reports, 2016–2023.
• Riedel, Bruce. Kings and Presidents: Saudi Arabia and the United States Since FDR. Brookings Institution Press, 2018.

Related Theories

• 9/11 Inside Job Theory — The broader theory alleging U.S. government orchestration or complicity in the attacks, distinct from the more specific question of Saudi support.
• 9/11 Advance Knowledge — Claims that various parties had foreknowledge of the attacks, including questions about intelligence warnings and their handling.
• Insider Trading Before 9/11 — Suspicious financial activity, including unusual options trading on airline and insurance stocks in the days before September 11.