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Evidence Surviving the Cleanup Operation

Although the physical evidence was destroyed, photographic, video, and eyewitness evidence survives.

This evidence shows:

  • Dust and fragments were ejected from the towers at high velocities.
  • The tops of the towers exploded into descending mushrooming clouds of dust.
  • The mushrooming dust clouds remained centered as they devoured the towers.
  • The dust clouds grew to volumes several times the buildings' volumes, and covered Lower Manhattan with dust.
  • The non-metallic components of the towers and their contents were pulverized to sub-100-micron dust.
  • The steel superstructures were shredded.
  • Intense heat in the basements melted the foundations of the core columns.

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