September 11 Attacks: The devastating scene from 20 years ago
As America marks the sombre 20th anniversary of the September 11 terrorist attacks, stirring satellite imagery from Maxar Technologies capture the devastation from that tragic day that changed the world forever.
The attacks, which were planned by Al-Qaeda from Afghanistan, saw four US passenger jets seized by suicide attackers - two of which were flown into the Twin Towers of the World Trade Center in New York.
The destruction at ground zero can be seen more clearly in this IKONOS image from September 15, 2001, when most of the smoke was gone
IKONOS collected this image of smoke rising above ground zero, where the Twin Towers collapsed on September 11, 2001
Another plane crashed into the Pentagon, just outside the US capital, Washington DC, and a fourth plane crashed in a field in Pennsylvania after passengers fought back.
Satellite images show Pentagon before and immediately after the attack. High res here
Satellite images show Pentagon before and immediately after the attack. High res
hereThe field where Flight 93 crashed in Shanksville, Pennsylvania, has become the Flight 93 National Memorial run by the US National Park Service. High res here
In a video posted on the eve of the anniversary, US president Joe Biden urged Americans to show unity, "our greatest strength."
"To me, that's the central lesson of September 11th. It's that at our most vulnerable, in the push and pull of all that makes us human, in the battle for the soul of America, unity is our greatest strength," Mr Biden said in a six-minute message from the White House.
The site of the Twin Towers has been rebuilt as the 9/11 National Memorial Museum
In the interim, Al-Qaeda founder Osama bin Laden has been hunted down and killed. A towering new sky scraper has risen over Manhattan, replacing the Twin Towers. And less than two weeks ago, the last US soldiers flew from Kabul airport, ending the so-called "forever war."
But the Taliban who once sheltered bin Laden are back ruling Afghanistan, the mighty US military humiliated.
The full story behind the most audacious terrorist attack in the world remains mired in secrecy. Only last week did Mr Biden order the release of classified documents from the FBI investigation over the next six months.
For the relatives of victims, the anniversary, as always, is about keeping the memory of their loved ones alive.
(With agency inputs)