"Directed Energy Weapons" refer to any number of types of unconventional and exotic weaponry.
The full range of these weapons is classified information, so no attempts will be made to distinguish between categories within the realm of energy weapons, as doing so would imply specific knowledge of all that are available.
In addition, no claim is be made about whether the directed energy weapon operates from a space-, air-, or ground-based platform, nor are any claims made about whether or not it involves sound waves, antimatter weapons, scalar weapons, a facility like HAARP, etc.
However, the evidence appears consistent with the use of energy weapons that go well beyond the capabilities of conventional explosives.
Wikipedia article on Directed-Energy Weapons
Although speculation about DEWs on 9/11 began shortly after the event, one of the first scientists with relevant credentials to publicly propose the DEW hypothesis was Dr. Judy Wood, a former professor of mechanical engineering.
The following material is largely from her book Where Did the Towers Go?, as well as from her old and new websites.
Where Did the Towers Go?
I. 9/11 Enigmas
II. New Nomenclature
Not saying DEW'S don't exist or are not in operation... I think it's pretty clear they used planes (possibly remote controlled).. and explosives/thermite or something similar.
Agreed. Why wouldn’t they just demolish it like they would any other steel building. With explosives and thermite. Analysis of a found steel column that they weren’t able to hide (they gathered and hid most evidence) supports this thermite theory.
Also keep in mind debris can be seen exploding very far OUTWARD from the building. Thus indicating controlled explosions from the INSIDE.