An American flag that firefighters hoisted at ground zero in the hours after the September 11 terror attacks is returning to the World Trade Center site after disappearing for more than a decade.
The flag will goes on display on Thursday at the September 11 museum in New York.
It was the centre piece of a photo that became a defining image of patriotic perseverance. The image shows three firefighters raising the flag over the rubble.
The flag was turned in two years ago by an as-yet-unidentified man at a firehouse in Everett, Washington.
Painstaking tests and examinations indicated it was the same Star Spangled Banner.
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It comes ahead of the 15th anniversary of the attacks on Sunday.
