Satellite images of 9/11 US attack emerges on 20th anniversary

New Delhi : As America marks the 20th anniversary of devastating attack on the Twin tower, better known as 9/11, satellite images of the event have surfaced online.

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.

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.

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 mastermind of the attacks, Osama Bin Laden, was hunted down and killed by the US Forces in Afghanistan.