Remembering September 11 ten years on
September 11, 2001 changed the world as we knew it.
Almost 3,000 people lost their lives, and many more were injured in the terrorist attacks that struck America.
With the tenth anniversary of that terrible day approaching, tributes are being held across the US.
This weekend in New York thousands will hold hands along the waterfront of Lower Manhattan, forming a human chain heading north, to "reflect, remember and unite."
And on the day of the anniversary the National 9/11 Memorial at the former World Trade Center complex will open for a special dedication ceremony for families of the victims.
We take a look at the changing aspect of 'Ground Zero' since that fateful Tuesday morning ten years ago.
The Manhattan skyline before the terrorist attacks took place on the morning of September 11, 2001
American singer Jon Bon Jovi and guitarist Richie Sambora perform while filming a charity video clip with New York City police officers and firefighters in the wake of the attacks
Since the day of the tragedy many dignitaries have visited Ground Zero. Prince Harry lays a wreath as he pays his respects in 2009
Queen Elizabeth II visited the site with the Duke of Edinburgh in 2010 after completing an eight-day tour of Canada
Barack Obama meets up with New York firefighters, who suffered many casualties
Construction continues on the National September 11 Memorial & Museum at the World Trade Center site.
The memorial features two reflecting pools on the 'footprints' of the twin towers
The Tribute in Light memorial has shone behind the Statue of Liberty since 2002
Relatives of those who died gather every year to commemorate those who lost their lives
Family members of the victims write notes and leave flowers on the ninth anniversary
A model shows what the World Trade Center site will look like in a near future
More than 3,000 people were killed in the airline attacks on the World Trade Center and the Pentagon, and in the crash of a fourth hijacked plane in Pennsylvania
Desolation after the collapse of the towers
New York's skyline today