By Ephraim Agbo
There are events that become history almost immediately. And then there are events that continue to generate questions long after the events themselves have ended. September 11, 2001 belongs to the second category. Twenty-five years later, the most revealing question is not simply what happened. It is what remains unresolved—and why.
The images remain unnaturally vivid: the first tower burning against a clear blue sky; the second aircraft appearing live on television; people running through Manhattan beneath a cloud of dust; firefighters climbing stairs while others descended; the South Tower collapsing; the Pentagon burning; a field in Pennsylvania where another aircraft came down. Nearly 3,000 people were killed that morning. But the physical destruction was only the beginning.
September 11 changed American foreign policy. It changed aviation. It changed intelligence. It changed surveillance. It changed the legal definition of national security. It changed Afghanistan. It changed Iraq. It changed the Middle East. And it altered the relationship between citizens and the state.
The official account is extensively documented at its central point: al-Qaeda planned the attacks and 19 hijackers carried them out. The FBI identifies the 19 men as the hijackers, and the 9/11 Commission reached the same fundamental conclusion.
But that conclusion does not resolve every question surrounding the attacks, the intelligence failures that preceded them, the physical destruction of the buildings, the identities and activities of people connected to the hijackers, or the decisions made in the aftermath. This is where the historical debate begins.
There is a difference between asking whether al-Qaeda carried out 9/11 and asking whether American intelligence agencies failed to prevent it. There is a difference between asking whether the aircraft struck the buildings and asking whether every aspect of the subsequent collapses has been adequately explained. There is a difference between identifying a suspicious circumstance and establishing what caused it. The history of 9/11 becomes clearer when those distinctions are maintained.
The Morning That Broke the Old World
At 8:46 a.m. Eastern Time, American Airlines Flight 11 struck the North Tower. At 9:03, United Airlines Flight 175 struck the South Tower. At 9:37, American Airlines Flight 77 hit the Pentagon. At 9:59, the South Tower collapsed. At 10:03, United Airlines Flight 93 crashed near Shanksville, Pennsylvania. At 10:28, the North Tower collapsed. The sequence is now familiar. What was less familiar that morning was the strategic logic behind the attacks.
Hijacking had traditionally meant taking an aircraft hostage. The expectation was negotiation, publicity and, potentially, the release of prisoners. The 9/11 attackers used the aircraft differently. The aircraft themselves became the weapons.
America's aviation-security system had largely been designed around a different conception of hijacking. The 9/11 Commission would later identify a "failure of imagination" as one of the central failures surrounding the attacks.
That finding raises a broader question about modern intelligence systems: How does a government distinguish between information that represents a general threat and information that signals an imminent, specific attack?
The Most Uncomfortable Fact: America Had Warnings
The popular version of 9/11 sometimes implies that the attacks emerged from complete darkness. They did not. The United States had been tracking Osama bin Laden and al-Qaeda for years. The embassy bombings in Kenya and Tanzania in 1998 demonstrated al-Qaeda's international reach. The USS Cole attack in Yemen in October 2000 demonstrated that al-Qaeda could strike sophisticated American military targets.
By 2001, American intelligence had accumulated extensive information about bin Laden and his organization. The Senate-House Joint Inquiry into 9/11 later stated that the intelligence community had collected a "great deal" of valuable intelligence concerning bin Laden and al-Qaeda. It also concluded that during the spring and summer of 2001 there was a significant increase in information indicating that bin Laden and al-Qaeda intended to strike U.S. interests in the very near future.
The significance of that finding is straightforward: American intelligence was not operating without information about the threat. The question is what that information meant at the time, how specific it was, who received it, how it was interpreted and what actions were taken in response.
And the documentary record has continued to expand. On the 25th anniversary, the Trump administration released a large collection of declassified President's Daily Briefs related to the period preceding the attacks. The documents contain intelligence assessments and warnings provided to presidents in the years and months before September 11. One memo included a warning about possible hijackings.
"Nevertheless, FBI Information since that time indicates patterns of suspicious activity in this country consistent with preparations for hijackings or other types of attacks, including recent surveillance of federal buildings in New York," the memo read.
A different 1998 memo discussed intelligence indicating that bin Laden was preparing for attacks, including the possibility of an airline hijacking. That particular warning, however, contemplated a hijacking as part of an effort to secure the release of prisoners rather than the use of hijacked aircraft as weapons in the manner that occurred on September 11.
Other documents indicated that the intelligence community was aware of bin Laden's intention to bring terrorist attacks to the United States, including warnings presented to President George W. Bush concerning al-Qaeda's intentions.
These documents complicate the idea that September 11 was entirely unforeseeable. They do not, by themselves, establish that U.S. officials knew the precise date, targets, methods or scale of the coming attacks. That distinction is important. Intelligence warnings can be genuine without being sufficiently specific to permit authorities to prevent a particular attack.
The resulting question is therefore not simply whether America had warnings, but what those warnings actually communicated to decision-makers and whether the available information could reasonably have been converted into preventive action.
The Intelligence Failure Was Real—and It Was Bigger Than One Agency
The intelligence failure was not confined to a single institution. The Joint Inquiry found serious problems in information sharing between intelligence agencies, within agencies, between intelligence and law enforcement, and between federal agencies and state and local authorities. It also examined failures involving Khalid al-Mihdhar and Nawaf al-Hazmi and the difficulties the FBI experienced in developing an adequate understanding of al-Qaeda's activities inside the United States. The broader picture was one of fragmented information and institutional barriers.
Different agencies possessed different pieces of information. Classification restrictions affected information sharing. Intelligence and law-enforcement cultures operated differently. Watchlisting procedures had weaknesses. Analysts faced difficulties connecting individual pieces of information to a larger operational picture. This creates an important distinction in the 9/11 debate.
An intelligence failure does not necessarily imply that no one possessed useful information. It can mean that relevant information existed but was not connected, interpreted or acted upon in time. The question of why that happened remains one of the central subjects of the post-9/11 investigations.
The "Stand-Down" Theory
One of the most persistent 9/11 theories concerns the U.S. military response. If America had fighter aircraft capable of intercepting unidentified aircraft, why were the hijacked planes not intercepted before reaching their targets? Some critics have argued that the fighters were deliberately ordered to stand down.
The 9/11 Commission investigated the military response and reconstructed the sequence of communications between the Federal Aviation Administration, NORAD and military commanders. Its account described a response complicated by incomplete and sometimes incorrect information. NORAD was operating within procedures developed for a different threat environment. Information about the hijacked aircraft did not always reach military commanders quickly enough, while confusion developed over aircraft identities and locations. At one point, military officials were responding to erroneous information concerning a phantom aircraft.
The Commission's reconstruction therefore provides a substantially different account from the deliberate-stand-down theory. At the same time, the evolution of the official account itself has become part of the controversy. Earlier public explanations of the military response contained inaccuracies and were subsequently revised as investigations reconstructed what had happened.
For critics, those discrepancies raise questions about the reliability of the initial official narrative. For investigators, the changes have been explained as the result of reconstructing a rapidly developing event in which different participants possessed incomplete information.
The evidence and interpretation remain separate questions. An inaccurate early account demonstrates that the initial account was inaccurate. It does not, by itself, establish why it was inaccurate.
The Twin Towers: Fire, Steel and the Controlled-Demolition Question
The physical evidence presents another major area of debate. The Twin Towers were struck by commercial aircraft traveling at high speed. The impacts destroyed structural components, damaged floors and columns, and stripped fireproofing from portions of the structures. Large fires subsequently burned across multiple floors.
The National Institute of Standards and Technology conducted extensive investigations and concluded that the aircraft impacts and resulting fires initiated the collapses. NIST concluded that the towers were not brought down by controlled demolition.
According to NIST's reconstruction, the aircraft impacts severed perimeter columns, damaged interior core columns and dislodged fireproofing. The loads carried by damaged and severed columns were redistributed to other structural members. The jet fuel ignited fires that were subsequently sustained by the building's contents and oxygen entering through damaged sections of the buildings.
NIST concluded that heat weakened structural components and caused floor systems to sag. The sagging floors exerted forces on perimeter columns, causing them to bow inward. The resulting structural failures then led to collapse. But there is a point of contention that deserves to be stated precisely.
NIST did not test the recovered structural steel from the towers for explosive or thermite residues. Advocates of the controlled-demolition theory cite this as a limitation of the investigation and argue that chemical residue testing should have been performed. That fact establishes that such testing was not conducted. It does not establish what the results would have been or whether explosives were present.
Architects & Engineers for 9/11 Truth argues that the destruction of the Twin Towers and WTC 7 was the result of controlled demolition. The organization points to the apparent rapidity and symmetry of the collapses, reports of explosions and aspects of the structural behavior of the buildings.
NIST and other investigators reached a different conclusion, attributing the collapses to the combination of aircraft impacts, fireproofing damage, fire and subsequent structural failure.The disagreement therefore involves competing interpretations of physical evidence.
For the controlled-demolition hypothesis to become an established historical explanation, however, evidence would need to establish not merely that the collapses resembled controlled demolition to some observers, but that explosives were actually introduced into the buildings, identify the mechanism used, establish who had access and demonstrate how such an operation was carried out. I'm kNo publicly established evidentiary chain has demonstrated those elements.
That does not eliminate the questions raised by critics. It defines what remains to be demonstrated if those questions are to become evidence for a specific alternative explanation.
WTC 7: The Building That Became the Symbol of Doubt
If the Twin Towers generated debate, WTC 7 became one of the most frequently cited subjects in the 9/11 controversy. It was not struck by an aircraft. It was a 47-storey steel-framed building. It suffered fires and structural damage during the attacks and collapsed at 5:20 p.m. For many observers, the appearance of its collapse raises a straightforward question: How could fire bring down a skyscraper in a manner that appeared similar to controlled demolition?
NIST's investigation concluded that debris from the North Tower damaged WTC 7 and that uncontrolled fires burned for almost seven hours. According to NIST, thermal expansion caused structural components to move and fail, eventually producing a progressive collapse involving a critical column.
NIST also addressed the apparent free-fall portion of the descent. Its analysis divided the visible collapse into stages and concluded that the period of free fall occurred after internal structural support had already been lost.
AE911Truth rejects that explanation and argues that WTC 7's appearance and structural behavior are evidence of controlled demolition. The significance of WTC 7 therefore depends partly on how the physical evidence is interpreted.
One interpretation holds that the building's collapse can be explained through fire-induced structural failure and progressive collapse. Another argues that the observed behavior is inconsistent with that explanation and requires controlled demolition. NIST investigated the possibility of a blast and concluded that there was no evidence of an explosive event.
The existence of disagreement does not itself resolve the disagreement. The relevant historical question is what evidence can independently distinguish between the competing explanations.
The Saudi Connection: The Question That Never Went Away
Fifteen of the 19 hijackers were Saudi citizens. That fact has made Saudi Arabia an unavoidable part of the discussion surrounding 9/11. But nationality alone does not establish state responsibility.
The 9/11 Commission found no evidence that the Saudi government as an institution funded al-Qaeda. At the same time, the investigation examined individuals, charities and networks connected to Saudi Arabia and considered whether some had provided assistance to al-Qaeda. The declassification of material associated with the so-called "28 pages" subsequently intensified public interest in the issue.
Thomas Kean and Lee Hamilton, the chairmen of the 9/11 Commission, later explained that the 28 pages were based largely on raw, unvetted material that had reached the FBI. The material consisted of investigative leads that had not necessarily been substantiated.
The Commission's report stated that it found "no evidence that the Saudi government as an institution or senior Saudi officials individually funded" al-Qaeda. It also noted that this conclusion did not exclude the possibility that charities with significant Saudi government sponsorship diverted funds to al-Qaeda. The distinction is important.
There are at least several different questions: whether individual Saudis assisted the hijackers; whether Saudi charities or religious networks provided assistance; whether Saudi officials had knowledge of such activity; whether elements of the Saudi state were involved; and whether the Saudi government itself directed or financed the attacks. Those propositions require different levels and types of evidence.
The debate intensified further as additional material concerning Omar al-Bayoumi and other individuals came under scrutiny. Bayoumi was investigated by U.S. authorities in connection with his contacts with hijackers Nawaf al-Hazmi and Khalid al-Mihdhar. Newly revealed material has also drawn attention to Bayoumi's contacts with Anwar al-Awlaki and Saudi religious officials.
One clip from 1997 or early 1998 shows Bayoumi filming a paintball session near San Diego involving Awlaki. The footage has subsequently been discussed in connection with allegations that some participants were engaged in activities associated with jihadist training.
Among material seized from Bayoumi was a handwritten plane diagram containing mathematical calculations concerning a plane's height and distance from an object on the ground. A federal judge later described the page as connecting Bayoumi, on its face, with knowledge related to the 9/11 attacks.
The significance of such material remains contested. A document can be suspicious without establishing the precise circumstances in which it was created, its purpose or what its author actually knew.
Bayoumi was released on September 28, 2001, after U.S. officials determined there was insufficient evidence to seek his extradition. Former DOJ official Jeffrey Breinholt later argued that the plane diagram could have been significant evidence. The broader Saudi question therefore remains one of distinguishing association from responsibility.
Evidence concerning individuals or networks does not automatically establish responsibility by the Saudi state. Conversely, the absence of a finding of institutional responsibility does not make every individual connection irrelevant. The historical record requires those distinctions to remain intact.
The Iraq Question: Did 9/11 Become a Pretext?
The relationship between 9/11 and the Iraq War remains one of the most consequential questions of the post-attack period.
Iraq did not carry out the 9/11 attacks. The 9/11 Commission found contacts between Iraqi officials and al-Qaeda representatives but found no evidence that those contacts developed into a collaborative operational relationship or that Iraq cooperated with al-Qaeda in attacks against the United States.
The United States nevertheless invaded Iraq in 2003.
The invasion transformed the Middle East. It removed Saddam Hussein's government, disrupted Iraqi institutions, intensified sectarian conflict and contributed to a regional environment in which later jihadist movements expanded.
The political question that followed was whether the trauma of 9/11 had been used to build support for policies that extended beyond the original objective of defeating al-Qaeda.
That question is different from claiming that Iraq planned or participated in the attacks.
The historical record establishes that the attacks created a radically altered political environment in which military action that might previously have faced greater resistance became possible. Determining whether particular policymakers deliberately exploited that environment for objectives unrelated to the attacks requires examination of their statements, decisions and internal deliberations.
The existence of political benefit does not, by itself, establish prior involvement in the event that created the opportunity.
The "Who Benefited?" Argument
Another persistent line of inquiry asks who benefited from the attacks.
The post-9/11 national-security establishment expanded considerably. Military spending increased. Intelligence agencies received new authorities and resources. The Department of Homeland Security was created. Surveillance powers expanded. Defense contractors benefited from increased military and security spending. New geopolitical objectives became politically possible.
The USA PATRIOT Act expanded government investigative and surveillance powers. The administration of President George W. Bush subsequently made the case for military action against Iraq, including its presentation to the United Nations in 2003.
These are matters of historical record.
The question is what they demonstrate.
A benefit received after an event can provide a reason to investigate an actor's interests. It does not by itself establish that the beneficiary caused the event.
At the same time, examining who gained political, economic or strategic advantages from a crisis is a legitimate part of historical and investigative analysis. The difficulty lies in distinguishing motive or opportunity from evidence of participation.
Why Conspiracy Theories Became So Powerful
The persistence of 9/11 conspiracy theories cannot be explained simply by ignorance.
The event produced an unusual combination of circumstances: enormous human loss, spectacular visual evidence, intelligence warnings that became clearer in retrospect, conflicting early reports, institutional failures and far-reaching political consequences.
Such conditions naturally create questions about causation.
People often seek explanations proportionate to the scale of an event. A catastrophe involving thousands of deaths and reshaping global politics can appear difficult to reconcile with ordinary bureaucratic failure.
Yet large institutions can fail through fragmented information, miscommunication, competing priorities, incorrect assumptions and delayed decision-making.
At the same time, deliberate-action explanations can become attractive because they provide a clear chain of intention where the alternative involves uncertainty, coincidence or institutional dysfunction.
The 9/11 Truth Movement gained momentum partly because the official account changed in some areas and because early reporting contained errors.
The BBC, for example, mistakenly reported that World Trade Center 7 had collapsed before it actually did. The broadcaster later explained the error, which occurred during chaotic live coverage.
For critics of the official account, such incidents became part of a wider pattern that warranted further investigation. For others, they represented examples of the confusion and mistakes that naturally accompany live reporting during an unprecedented disaster.
The distinction between the two interpretations remains important.
The Evidence Supporting the Official Account
The official account has several major evidentiary foundations.
There is extensive evidence identifying the 19 hijackers. The 9/11 Commission reconstructed the plot in considerable detail. The intelligence community had tracked al-Qaeda for years. The attacks corresponded with al-Qaeda's documented ideology and operational interests. Investigators established extensive logistical connections involving the attackers' travel, flight training, accommodation and relationships with al-Qaeda operatives.
Later investigations did not establish a credible evidentiary chain demonstrating that the U.S. government orchestrated the attacks.
The physical evidence has also been extensively investigated. NIST attributed the collapse of the Twin Towers to aircraft impacts, loss of fireproofing, fires and subsequent structural failure, while its investigation of WTC 7 concluded that fire-induced structural failure produced progressive collapse.
The volume and convergence of this evidence are central to the conventional historical account.
The Questions Raised About the Official Account
At the same time, several aspects of the official history remain subjects of scrutiny.
The intelligence warnings were substantial. The summer of 2001 was marked by unusually alarming reporting. The CIA and FBI failed to share critical information effectively. The military response involved confusion and incorrect information. Early official accounts contained inaccuracies. The Saudi connection proved more complicated than a simple question of nationality. The 28 pages remained classified for years. WTC 7 continues to generate disagreement. NIST did not conduct explosive-residue testing on the recovered steel from the towers. Government powers expanded dramatically after the attacks. And the Iraq invasion followed despite the absence of evidence that Saddam Hussein's government had collaborated operationally with al-Qaeda in the 9/11 attacks.
None of these facts, individually or collectively, automatically establishes a particular alternative explanation.
But they are part of the historical record, and they explain why questions about 9/11 have continued for 25 years.
The Critical Question: Failure or Facilitation?
One of the central questions can be framed around three propositions.
Proposition One: The government knew nothing.
The available record does not support this formulation. U.S. intelligence agencies possessed substantial information concerning al-Qaeda and its intentions.
Proposition Two: The government possessed significant warning information but failed to prevent the attacks.
This proposition is supported by the findings of congressional and independent investigations documenting intelligence, communication, analytical and operational failures.
Proposition Three: Elements of the government deliberately facilitated or orchestrated the attacks.
This is a substantially different claim. Establishing it would require evidence linking specific officials or institutions to planning, preparation, facilitation or execution.
After 25 years, no publicly established evidentiary chain has demonstrated that U.S. officials planned the attacks.
That statement does not resolve every disputed question. It identifies the evidentiary position of the public record.
Nor does it establish that every government account, every investigative decision or every classified document should be accepted without scrutiny.
Those are separate questions.
The Most Important Possibility May Be Institutional Failure
One possible explanation for the failures surrounding 9/11 lies in the structure of large bureaucratic institutions.
Information was scattered. Agencies did not communicate effectively. Warnings were not always connected. Domestic and foreign intelligence operated within different institutional frameworks. Watchlisting systems had weaknesses. Analytical processes failed to connect individual pieces of information. The military operated under assumptions developed for a different threat environment. Law-enforcement and intelligence cultures often approached information differently.
This does not provide an answer to every question surrounding 9/11.
It does, however, demonstrate that catastrophic events can emerge from the interaction of multiple institutional weaknesses rather than from a single failure.
Whether that adequately explains every disputed aspect of September 11 remains part of the broader historical debate.
The First Responders: The War After the War
There is another part of 9/11 that receives less attention than geopolitics.
The people who survived the attacks did not necessarily escape their consequences. Firefighters. Police officers. Paramedics. Construction workers. Volunteers. Residents. People who worked around Ground Zero.
Many inhaled the toxic dust created by the destruction of the towers. The health consequences continued for decades.
The World Trade Center Health Program has documented extensive illnesses among responders and survivors, including respiratory diseases and cancers associated with exposure at the World Trade Center site.
The dust contained a complex mixture of materials generated by the collapse and burning of the buildings, including concrete, glass, drywall components, combustion products and other substances.
First responders were also exposed to asbestos, heavy metals and other hazardous compounds.
The latency period for some diseases, including certain cancers, can extend for decades. As a result, some people are still experiencing consequences from exposure that occurred on September 11 and during the recovery operation that followed.
The attacks therefore produced consequences that extended far beyond the morning of September 11.
The World After 9/11
To understand 9/11, one cannot stop the story at the moment the towers fell.
The second chapter began immediately.
America declared a global war on terrorism. Afghanistan became the first battlefield. The Taliban government was overthrown. Then came Iraq. Then Guantánamo. Then extraordinary rendition. Then expanded surveillance. Then drone warfare. Then the transformation of airport security. Then the creation of the Department of Homeland Security.
The chain of consequences became enormous.
The post-9/11 period reshaped not only American institutions but also international law, military strategy, intelligence cooperation, immigration policy, aviation security and relations between governments and their populations.
The Muslim World Experienced a Different 9/11
This perspective is essential to understanding the event's global legacy.
For many Americans, September 11 is remembered primarily through the destruction of the World Trade Center, the attack on the Pentagon and the deaths of American civilians.
For many Muslims outside America, 9/11 is also remembered through what followed: Afghanistan. Iraq. Civilian deaths. Refugees. Drone strikes. Interrogation programs. Guantánamo. Airport profiling. Islamophobia. Military occupations. The War on Terror.
These experiences do not cancel one another.
They demonstrate how the same historical event can produce very different memories in different societies.
For one population, 9/11 became a memory of mass-casualty terrorism. For another, it became the beginning of wars, military interventions, displacement, surveillance and changes in how Muslim communities were treated.
Both dimensions form part of the history of the post-9/11 world.
The Legacy That Refuses to End
Twenty-five years later, the towers are gone.
But the institutional and political architecture created or accelerated by 9/11 remains.
It exists in airport security. It exists in intelligence agencies. It exists in surveillance systems. It exists in America's military posture. It exists in Afghanistan's history. It exists in Iraq's political landscape. It exists in the memories of Muslim communities. It exists in the illnesses of first responders. It exists in families that never recovered. It exists in the political vocabulary of terrorism. And it exists in continuing debates about government power and institutional trust.
The attacks lasted only a few hours.
Their consequences have lasted a quarter of a century.
Conclusion: The Questions Are Part of the History
Twenty-five years after September 11, the historical record contains both substantial answers and unresolved questions.
The available evidence establishes a detailed account of an al-Qaeda operation involving 19 hijackers. It also establishes that American intelligence agencies possessed significant information about al-Qaeda before the attacks and that serious failures occurred in intelligence sharing, analysis, watchlisting, communication and military response.
Beyond those broad areas of agreement, substantial debates remain.
Questions continue to surround the interpretation of intelligence warnings, the early accounts of the military response, the Saudi connections, the handling of individuals associated with the hijackers, the physical mechanisms involved in the destruction of the World Trade Center buildings, the investigation of WTC 7, and the political decisions that followed the attacks.
Some of the alternative explanations advanced over the years have not been supported by publicly established evidence. Others have raised questions about gaps, inconsistencies or investigative decisions without necessarily establishing a different explanation for the attacks.
That distinction is important.
A question is not proof. A discrepancy is not automatically evidence of a conspiracy. But neither should the existence of an official explanation make legitimate questions impermissible.
The task of history is not to decide what is most comforting. It is to examine what can be established, identify what remains uncertain, distinguish evidence from inference, and allow competing interpretations to be tested against the available record.
Perhaps that is the most important lesson of September 11 at 25.
The event itself is history.
The evidence surrounding it continues to be examined.
And the questions that remain should be judged not by how reassuring—or disturbing—their answers may be, but by the quality of the evidence that answers them.
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