U.S. military withdrawal from Afghanistan reaches completion
U.S. military withdrawal from Afghanistan completed, ending post-9/11 military engagement.
Event / Security
9/11 Health Crisis
Long-term health consequences affecting first responders, workers, and civilians exposed to toxic dust and debris from the September 11 attacks, including cancer diagnoses, respiratory diseases, and compensation efforts through the James Zadroga Act.
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2026-09-04 to 2026-11-07 · UTC publication dates
Coverage begins 27 Aug, 04:04 UTC
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What happened
United States military withdrawal from Afghanistan completed
The United States completed its withdrawal from Afghanistan, with the withdrawal timed to coincide with the 20th anniversary of 9/11. The withdrawal was characterized by critics as poorly executed.
No large-scale follow-up terrorist attack occurred on scale of 9/11
In the 20 years following the 9/11 attacks, no terrorist attack on the scale of 9/11 occurred in the United States, despite initial fears of large-scale follow-up attacks.
25th anniversary of 9/11 observed in 2026
Americans paused to remember the lives lost in the 9/11 attacks on the 25th anniversary of the tragedy on September 11, 2026.
Nearly 3,000 people killed in 9/11 attacks
Nearly 3,000 people were killed in the coordinated terrorist attacks on September 11, 2001, carried out by Al Qaeda. The attacks targeted the World Trade Center towers in New York, the Pentagon, and resulted in additional deaths in Shanksville, Pennsylvania.
Two commercial aircraft struck World Trade Center towers
Two large passenger jets plowed into the North Tower and South Tower of the World Trade Center in Manhattan on September 11, 2001. The first aircraft struck the North Tower, followed by a second plane hitting the South Tower.
Approximately 658 employees of Cantor Fitzgerald killed in attacks
Cantor Fitzgerald, a major financial services firm occupying the top floors of the North Tower, lost 658 employees in the 9/11 attacks.
Both World Trade Center towers collapsed after attacks
Both the North Tower and South Tower of the World Trade Center collapsed following the impact of the aircraft, enveloping lower Manhattan in ash and debris.
Al-Qaeda terrorists hijack four commercial airplanes on September 11, 2001
Nineteen al-Qaeda terrorists hijacked four commercial airplanes on September 11, 2001. Two planes were flown into the Twin Towers of the World Trade Center in New York City, a third struck the Pentagon in Arlington, Virginia, and a fourth crashed in a field near Shanksville, Pennsylvania.
Khalid Sheikh Mohammed, accused 9/11 mastermind, awaits trial 23 years after capture
Khalid Sheikh Mohammed, accused of masterminding the September 11 attacks, still awaits trial 23 years after his capture.
September 11 attacks result in approximately 3,000 deaths
The September 11, 2001 terrorist attacks resulted in the deaths of 2,977 people across all four attack sites.
Pentagon struck by hijacked airplane, 184 killed
A hijacked airplane struck the Pentagon in Arlington, Virginia, killing 184 people, most of them inside the building.
Al-Qaeda leader Osama bin Laden killed in Pakistan
The United States military found and killed al-Qaeda leader Osama bin Laden in Pakistan in 2011, nearly a decade after the September 11 attacks.
Zohran Mamdani becomes first Muslim mayor of New York City
Zohran Mamdani, a 34-year-old Democrat, is serving as New York City's first Muslim mayor. The 34-year-old was an elementary school student in New York on September 11, 2001.
Department of Homeland Security established following 9/11 attacks
The Department of Homeland Security, numerous state anti-terrorism laws, and billions of dollars in state and local counterterrorism funding were created in response to the September 11 attacks.
First-time moment of silence added for 9/11 victims who died from exposure-related illnesses
At the 25th anniversary ceremony in 2026, a silent moment was added for the first time to honor people exposed to toxic dust from the collapse of the World Trade Center Twin Towers who have since died of cancer and other illnesses.
World Trade Center Twin Towers collapse following airplane impacts
Both towers of the World Trade Center in New York City collapsed following the impact of two hijacked airplanes, resulting in the deaths of more than 2,600 people at the site.
Living former U.S. presidents convene for 25th anniversary commemoration
Vice President JD Vance and the nation's four living former presidents attended the 25th anniversary ceremony at the National September 11 Memorial in New York, where names of those killed were read.
United States launches war in Afghanistan following 9/11 attacks
The September 11 attacks led to sweeping changes in U.S. national security and foreign policy, including the initiation of a war in Afghanistan that became Washington's longest war.
United Airlines Flight 93 crashes after passengers resist hijackers
Passengers and crew members aboard United Airlines Flight 93 fought back against hijackers, forcing the plane to crash in a field near Shanksville, Pennsylvania. Forty-four people died in the crash.
President Trump attends Pentagon 9/11 anniversary ceremony
President Donald Trump attended a ceremony at the Pentagon Center Courtyard on the 25th anniversary of the September 11 attacks and was expected to speak.
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2 alternative perspectives
No major terrorist attack matched 9/11 scale in following decades
No attack of 9/11's magnitude has struck the U.S. in 25 years despite ongoing security threats.
NYC releases 170,000 pages of 9/11 documents as 25th anniversary approaches
NYC released 170,000 pages of 9/11 documents as the 25th anniversary approaches with expanded memorial ceremonies.
Attacks killed nearly 3,000 across coordinated strikes on American targets
Two planes struck the World Trade Center towers, killing nearly 3,000 across coordinated September 11 attacks.
Thousands dead, millions exposed: the 9/11 health crisis unfolds
More than 9,400 deaths and 50,000 cancer diagnoses linked to 9/11 exposure; $18.56 billion awarded in compensation.
25 years later: commemorating milestones of resilience and change
25th anniversary ceremonies included first Muslim mayor at Ground Zero and recognition of exposure-related deaths.
How 9/11 reshaped U.S. government and global military strategy
9/11 triggered creation of DHS, war in Afghanistan, and eventual killing of bin Laden in Pakistan.
Over 1,100 memorials across nation honor September 11 victims
Over 1,100 memorials nationwide honor September 11 victims through physical spaces and annual tributes.
Survivors and first responders confront September 11's human toll
Survivors and first responders faced devastating casualties; Flight 93 passengers resisted hijackers.
Saudi Crown Prince denies 9/11 involvement during White House visit
Saudi Crown Prince denies 9/11 involvement at White House as families pursue declassification of Saudi records.
Families, Congress push for declassification of Saudi 9/11 records
Families and Congress seek declassification of Saudi 9/11 records as litigation continues.
A quarter century on, 100 million Americans have no memory of 9/11
100 million Americans lack direct memory of 9/11, making institutional remembrance essential to generational transmission.