A bunch of eyewitnesses heard explosions as the building came down.
Actually the report goes to great length to look for any such reports and to examine all audio recordings and finds no evidence of explosions.
I attended, with an unsupervised group of 200 engineers from all fields, a presentation on these investigations. I did a lot of forensic work in construction and building codes for many decades.
People should read the reports. It is a lot of work to read them but it would have been impossible to falsify on the scale suggested.