9/11 Attacks: Remembering September 11, 2001 — 25 Years Later

Today, September 11, 2026, marks 25 years since the 9/11 Attacks.

They were the deadliest terrorist attacks in world history.

A quarter of a century on, the events of that morning continue to shape American security policy.

They also influence foreign relations and national memory.

Background: Who Carried Out the Attacks

Al-Qaeda orchestrated the 9/11 Attacks, led by Osama bin Laden.

Al-Qaeda had declared war on the United States years earlier.

It cited U.S. military presence in the Middle East, its support for Israel, and sanctions against Iraq among its grievances.

The group had already been linked to earlier attacks, including the 1998 U.S. embassy bombings in Kenya and Tanzania.

It also involved the 2000 bombing of the USS Cole in Yemen.

Organized into four teams, nineteen hijackers trained for the mission during the period leading to the 9/11 Attacks. Some attended flight schools in the U.S. to learn to pilot commercial aircraft, not to take off or land them.

Timeline of the Attacks

7:59 AM – American Airlines Flight 11 departs Boston’s Logan Airport bound for Los Angeles, carrying 11 crew and 76 passengers, including five hijackers.

8:14 AM – United Airlines Flight 175 departs Boston, also bound for Los Angeles, with five hijackers aboard.

8:19 AM – Flight attendants aboard Flight 11 alert ground control that the plane has been hijacked.

8:46 AM – Flight 11 crashes into the North Tower of the World Trade Center between the 93rd and 99th floors.

9:03 AM – Flight 175 crashes into the South Tower between the 77th and 85th floors, live on national television as networks were already covering the first crash.

9:37 AM – American Airlines Flight 77, hijacked after departing Washington Dulles Airport, crashes into the Pentagon.

9:59 AM – The South Tower of the World Trade Center collapses, 56 minutes after impact.

10:03 AM – United Airlines Flight 93, hijacked after departing Newark, crashes into a field near Shanksville, Pennsylvania, after passengers and crew, aware of the other attacks via phone calls, stormed the cockpit to try to retake the plane.

10:28 AM – The North Tower collapses, 102 minutes after impact.

The World Trade Center Attacks

The Twin Towers, then among the tallest buildings in the world, were struck less than 20 minutes apart. The impact and resulting fires caused catastrophic structural damage, and both 110-story towers eventually collapsed, along with several surrounding buildings in the World Trade Center complex. Lower Manhattan was engulfed in smoke and debris, and evacuation of the area took hours.

The Pentagon Attack

Flight 77 struck the western side of the Pentagon, the headquarters of the U.S. Department of Defense in Arlington, Virginia. The crash and resulting fire caused a section of the building to collapse, killing everyone aboard the aircraft along with military and civilian personnel working inside.

The Shanksville Crash: Flight 93

Passengers and crew aboard Flight 93 learned through phone calls to loved ones that other hijacked planes had already struck their targets. A group of passengers organized an attempt to retake control of the aircraft from the hijackers. The plane crashed into a field near Shanksville, Pennsylvania, killing all 44 people aboard. Investigators later concluded the hijackers’ intended target was likely the U.S. Capitol or the White House, meaning the passengers’ actions are widely credited with preventing a fifth attack site.

The Human Toll

The attacks killed nearly 3,000 people across all four sites, making September 11 the deadliest terrorist attack in world history and the single deadliest day for firefighters and law enforcement in U.S. history.

Casualty breakdown:

• World Trade Center: Over 2,750 deaths, including office workers, visitors, and emergency responders
• Pentagon: 184 deaths
• Flight 93: 44 deaths
• First responders killed: 343 New York City firefighters and 71 law enforcement officers died in the World Trade Center response
• Nationalities affected: Victims came from over 90 countries

In the years since, thousands of first responders, survivors, and Lower Manhattan residents have died or fallen seriously ill from cancers and respiratory diseases linked to toxic dust exposure at Ground Zero, a toll that continues to grow each year.

The Immediate Response

Within hours, U.S. airspace was shut down entirely for the first time in history, grounding thousands of flights. President George W. Bush, who was visiting a Florida elementary school when the attacks occurred, addressed the nation that evening, pledging that the United States would find those responsible.

Rescue and recovery efforts at Ground Zero continued for months, with firefighters, police, and volunteers searching the rubble for survivors and later for remains. The recovery effort became one of the largest in U.S. history.

How 9/11 Reshaped U.S. Policy

The attacks triggered sweeping changes across American government, security, and foreign policy:

• Department of Homeland Security: Created in 2002 to coordinate domestic counterterrorism efforts
• USA PATRIOT Act: Expanded government surveillance and law enforcement powers
• Transportation Security Administration (TSA): Established to overhaul airport security nationwide
• War in Afghanistan: Launched in October 2001 to remove the Taliban government, which had harbored al-Qaeda
• War in Iraq: Launched in 2003, justified partly by the broader “War on Terror,” though no direct link between Iraq and the 9/11 attacks was ever established
• Guantanamo Bay detention camp: Opened in 2002 to hold terrorism suspects

The Hunt for Osama bin Laden

Osama bin Laden evaded capture for nearly a decade after the attacks. U.S. forces finally located and killed him during a raid on his compound in Abbottabad, Pakistan, in May 2011, nearly ten years after 9/11.

Global and Cultural Impact

Beyond policy, 9/11 changed everyday life for millions of people worldwide, from airport security procedures to public attitudes toward safety and surveillance. The attacks also intensified global debates around immigration, religious tolerance, and civil liberties, with Muslim communities in the U.S. and elsewhere facing increased scrutiny and discrimination in the years that followed.

The site of the World Trade Center was rebuilt over the following two decades, with One World Trade Center, the National September 11 Memorial & Museum, and the twin reflecting pools now standing where the Twin Towers once stood.

How 9/11 Is Commemorated Today

Twenty-five years on, annual commemorations continue at all three attack sites:

• New York: Ceremony at the National September 11 Memorial, including the reading of all victims’ names and a moment of silence at 8:46 AM, the time the first plane struck
• Pentagon: Memorial service at the Pentagon Memorial in Arlington, Virginia
• Shanksville: Tribute at the Flight 93 National Memorial

Many cities across the U.S. also hold local tribute events, and flags are flown at half-staff nationwide.

FAQs

How many people died in the 9/11 attacks?
Nearly 3,000 people were killed across the World Trade Center, the Pentagon, and Flight 93, making it the deadliest terrorist attack in world history.

Who carried out the 9/11 attacks?
The attacks were carried out by 19 hijackers affiliated with al-Qaeda, the militant group led by Osama bin Laden.

What happened to Osama bin Laden?
Bin Laden evaded capture for almost a decade before being killed by U.S. forces during a raid in Abbottabad, Pakistan, in May 2011.

Why is Flight 93 significant?
Passengers aboard Flight 93 fought back against the hijackers after learning of the other attacks, causing the plane to crash in a Pennsylvania field rather than reach its intended target, believed to be the U.S. Capitol or White House.

What changed in the U.S. after 9/11?
The attacks led to the creation of the Department of Homeland Security and TSA, the passage of the USA PATRIOT Act, and the launch of the wars in Afghanistan and Iraq.

How is 9/11 commemorated each year?
Annual ceremonies are held at the World Trade Center site, the Pentagon, and the Flight 93 National Memorial, typically including moments of silence and the reading of victims’ names.

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Daniel Dappa

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