Added 2015 after reconsideration of the 3-second sighting of the final core columns falling virtually straight down. Frame 1 of the video is seen at left. The previous clip in the series ends before the event begins. Find at the NIST WTC Repository on archive.org. See in HD at the YouTube link above thanks to the excellent collection of TheMKMonarch.
NIST 14: CNN Dub4 38 (“spire” partial)
YouTube 1
