Newly released aerial photographs of the World Trade Center terror attack capture the towers’ collapse, from just after the first fiery plane strike to the dust clouds that spread over Lower Manhattan and New York harbor.

The images were taken from a police helicopter carrying the only photographer allowed in the air space near the towers on Sept. 11, 2001. They were obtained by ABC News after it filed a Freedom of Information Act request last year with the National Institute of Standards and Technology, which investigated the towers’ collapse.

The still images are “a phenomenal body of work” that show a new, wide-angle look at the towers’ collapse and the gray dust clouds that shrouded the city afterward, said Jan Seidler Ramirez, the chief curator of the National September 11 Memorial & Museum, which is compiling a digital archive of attack coverage. The photos are “absolutely core to understanding the visual phenomena of what was happening,” Ms. Ramirez said.