9/11 Remembrance Day: Key moments from the deadliest attack on US

The 9/11 attacks were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda against the United States on the morning of September 11, 2001. The attacks resulted in 2,996 fatalities, over 25,000 injuries, and substantial long-term health consequences, in addition to at least $10 billion in infrastructure and property damage. The attacks were the deadliest terrorist attacks in world history and the single deadliest incident for firefighters and law enforcement officers in the history of the United States.

The attacks began at 8:46 a.m. Eastern Daylight Time (EDT) when American Airlines Flight 11, a Boeing 767, crashed into the North Tower of the World Trade Center in New York City.

Seventeen minutes later, at 9:03 a.m. EDT, United Airlines Flight 175, also a Boeing 767, crashed into the South Tower of the World Trade Center.

At 9:37 a.m. EDT, American Airlines Flight 77, a Boeing 757, crashed into the Pentagon in Arlington, Virginia, just outside of Washington, D.C.

At 10:03 a.m. EDT, United Airlines Flight 93, a Boeing 757, crashed into a field in Stonycreek Township, Pennsylvania after some of the passengers and crew members attempted to regain control of the plane from the hijackers.

The 9/11 attacks had a profound impact on the United States and the world. They led to the War on Terror, a global campaign against terrorism, and to the creation of the Department of Homeland Security. The attacks also had a significant impact on the American economy and on the way that Americans viewed the world.

In the years since the attacks, there have been many memorials and tributes to the victims. The National September 11 Memorial & Museum was built on the site of the World Trade Center and is a place where people can remember the victims and learn about the events of that day. There are also many other memorials and tributes to the victims of the attacks around the United States and the world.