Numerous experts have stated that the collapse of the world trade centers was, or looked like, controlled demolition:

* An expert on demolition said that the trade centers were brought down with explosives (and see TV interview here; both in Danish)
* Two structural engineers at a prestigious Swiss university said that, on 9/11, World Trade Center 7 was brought down by controlled demolition (translation here)
* A Dutch demolition expert stated that WTC 7 was imploded
* A U.S. professor of physics stated that the world trade centers were brought down by controlled demolition
* A U.S. professor of mechanical engineering argued that the trade centers were brought down with explosives
* Several U.S. structural engineers, such as this one (second interview), have concluded that the collapse of the Trade Centers on 9/11 cannot be explained by the plane crashes and fires in the buildings
* An expert on why buildings collapse said controlled demolitions make buildings fall straight down (as opposed to falling over like a tree, which is what normally happens when buildings collapse) because the vertical columns are destroyed simultaneously by explosives, and "that's exactly what it looked like and that's what happened" on 9/11
* The head of a national demolition association stated that the collapse of the towers looked like a "classic controlled demolition"
* A terrorism security expert used by many news organizations asked, after commenting on the "secondary explosions", "whether in fact there wasn't something else at the base of the towers that in fact were the coup de grace to bring them to the ground" (keep in mind that a controlled demolition involves the use of explosives both at the base of the building and in higher sections of the building)

Many other experts have privately expressed skepticism of the official explanation for why the Trade Centers collapsed. Hopefully, they will also find the courage to come forward publicly.