Got to watch an hour of the film before it was yanked from Vimeo. Some points...
It was obvious that the initial thought by everyone was bomb since the FBI strong armed everyone out of the way from day one and there had been the bomb over Scotland a few years before.
Once they thought it wasn't a bomb then they did whatever it took to point it to malfunction. That doesn't mean it wasn't malfunction but any other possibilities were throw aside and even the CIA got involved.
The witness accounts were compelling but the filmmakers made a huge mistake having them tell their stories in a big room all in front of each other... Of course the stories will be similar if you do that and many people even used the same keywords and some even told different stories than they had it the past.