The images were taken from a police helicopter — the only photographers allowed in the airspace near the skyscrapers on Sept. 11, 2001. They were obtained by ABC after it filed a Freedom of Information Act request last year with the National Institute of Standards and Technology, the federal agency that investigated the collapse.

The chief curator of the planned Sept. 11 museum pronounced the pictures “a phenomenal body of work.”

The photos are “absolutely core to understanding the visual phenomena of what was happening,” said Jan Ramirez of the National September 11 Memorial & Museum. They are “some of the most exceptional images in the world, I think, of this event.”



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