There may have been 19 Saudi Arabian hijackers as a result of Blowback, but it was explosives that brought the three skyscrapers down.
Explosions were witnessed, tons of explosives were found in the rubble, and people were even arrested with tons of explosives on 9/11.
We don't need to speculate who demolished the World Trade Center, America needs to demand a more thorough investigation and stop being afraid to ask questions and learn the truth about the most deadly attack on American soil, which our foreign policy is based upon:
Fox News interviews architect Richard Gage, representing over 1000 architectural and engineering professionals whom have signed a petition to Congress demanding an independent investigation of 9/11:
National Aeronautics and Space Administration (NASA) infrared thermal imaging of the World Trade Center shows surface temperatures exceeding 1100 degrees above millions of tons of World Trade Center rubble. This NASA temperature data is excluded from the government fire investigation of the three 9/11 skyscraper collapses conducted by NIST. Extreme temperature measurements from NASA excluded from a fire investigation?
A team of scientists headed by Physicist Steven E. Jones, Professor of Physics, Emeritus, BYU Department of Physics and Astronomy, published a scientific paper finding evidence of tons of high tech nano-thermite high explosives in every sample of multiple samples of the World Trade Center dust. This high tech explosive is only known to have been developed in sophisticated department of defense laboratories using nano-technology.
Live mainstream news coverage of 9/11 includes explosions, witnesses of explosions, and people being arrested with explosives:
Hundreds of spies arrested, including explosive ordinance personnel: