Could be ... or something that took down Building 7 etc.
I have been told by several people with (formerly) high clearances that the military (and I assume spooks) has technology far more advanced than is revealed ... 25 or more years ahead of civilian in certain areas.
This is REQUIRED BY MILITARY HISTORY, which has taught us through all the ages that as soon as an offensive or defensive capability is revealed, adversaries will evolve countermeasures.
The prototype is perhaps the unbeatable Goliath, destroyed by a boy (David) with a novel approach.
My dad worked on development of the Abrams main battle tank before he retired from the Army in 1966. Design work probably started in the 50s. He also worked on some weapon/weapons system that he won’t tell me anything about because I don’t have clearance or a need to know, so that thing may still be out of public sight.
Building 7... it had fires raging all through it. Nothing more exotic is needed to bring down a tall building than too much heat weakening steel.
https://www.liveleak.com/view?t=d45_1320106542