NEW YORK (AP) — An American flag that firefighters hoisted at ground zero in the hours after the 9/11 terror attacks returns to the World Trade Center site after disappearing for more than a decade.

The 3-foot-by-5-foot flag goes on display Thursday at the Sept. 11 museum in New York.

It was the centerpiece 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 indeed the same Star Spangled Banner.

The History Channel will air a documentary about the flag’s recovery on Sunday, the 15th anniversary of the attacks.

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