Twenty-five years later, the images of September 11, 2001 remain among the most unforgettable moments in modern American history — four hijacked planes, the collapse of the World Trade Center, a nation in shock, and thousands of lives lost in a matter of hours.

The morning of September 11, 2001, began like an ordinary Tuesday across the United States.

Then, within less than two hours, everything changed.

Nineteen terrorists associated with al-Qaeda hijacked four commercial airplanes. Two were deliberately flown into the North and South Towers of the World Trade Center in New York City. A third struck the Pentagon in Arlington, Virginia. The fourth, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, after passengers and crew members fought back against the hijackers.

The First Plane Struck at 8:46 a.m.
At 8:46 a.m., American Airlines Flight 11 crashed into the North Tower.

The impact ignited fires across multiple floors and sent shockwaves through Lower Manhattan. People inside the tower began trying to escape as firefighters, police officers and emergency personnel rushed toward the scene.

Seventeen minutes later, another aircraft appeared over Manhattan.

At 9:03 a.m., United Airlines Flight 175 struck the South Tower.

Millions of people watching television suddenly understood that the first crash had not been an accident.

America was under attack.

The Towers Collapse
At 9:59 a.m., the South Tower collapsed.

Nearly half an hour later, at 10:28 a.m., the North Tower also fell.

The two buildings that had defined the New York skyline were suddenly gone, replaced by an enormous cloud of dust and debris.

For the people trapped inside and those attempting to rescue them, the collapse transformed an already catastrophic situation into an unimaginable disaster.

The 9/11 Memorial Museum describes the response at the World Trade Center as the largest rescue operation in New York City’s history. Approximately 2,000 police officers and nearly 1,000 firefighters were deployed to the scene.

The Pentagon Was Also Hit
At 9:37 a.m., American Airlines Flight 77 crashed into the Pentagon.

The attack killed 184 people at the Pentagon, including people aboard the aircraft and people inside the building.

Across the country, emergency services were responding to an attack whose full scale was still becoming clear.

Flight 93 and the Passengers Who Fought Back
One of the day’s most remarkable stories unfolded aboard United Airlines Flight 93.

After learning through phone calls that other hijacked planes had already struck the World Trade Center, passengers and crew members realized that their aircraft was likely part of the same attack.

They attempted to take control of the plane.

At 10:03 a.m., Flight 93 crashed into a field near Shanksville, Pennsylvania.

No one aboard survived, but the passengers’ counterattack prevented the hijackers from reaching their intended target in Washington, D.C., according to the 9/11 Memorial.

2,977 Lives Lost
The attacks killed 2,977 people from 90 nations.

Of those victims, 2,753 were killed in New York, 184 at the Pentagon and 40 aboard Flight 93.

They came from different backgrounds and generations.

They were office workers, flight attendants, firefighters, police officers, passengers, parents, children and visitors.

Behind every name was a family that would never again be the same.

The 9/11 Memorial’s In Memoriam exhibition honors the victims through thousands of photographs and personal remembrances, preserving the individual stories behind the enormous number.

The Heroes Who Ran Toward the Danger
As thousands of people desperately tried to escape the World Trade Center, police officers, firefighters, paramedics and other first responders moved toward the burning buildings.

Many never came home.

The 9/11 Memorial records 441 first responders killed as a direct result of the attacks — the greatest loss of emergency responders on a single day in American history.

But the story of September 11 was also filled with ordinary people helping strangers.

People guided one another down stairwells. Strangers carried the injured. Boats crossed the Hudson River to evacuate people from Manhattan.

In the middle of extraordinary terror, countless acts of courage unfolded.

Twenty-Five Years Later
On September 11, 2026, the United States marked the 25th anniversary of the attacks.

At the National September 11 Memorial & Museum in New York, families once again gathered to read the names of those who were killed. Moments of silence marked the times when the four attacks and the collapses occurred.

A quarter of a century has passed.

For those who lived through September 11, the memories remain vivid. For younger generations, it is increasingly an event they know through photographs, recordings, stories and the memories of parents and grandparents.

But the names remain.

The photographs remain.

And the stories of those who were lost — and those who ran toward danger to help others — continue to be remembered.