Eye Witnesses Describe Explosive Destruction of WTC 1 (North Tower).

"Floor by floor, it started popping out."

"It was as if they had detonated, you know, as if they were planned to take down a building, boom, boom, boom, boom, boom, boom, boom, boom, boom".

"All the way down".

~ Firefighters, Pat Zoda and Dennis Tardio

"I saw, from the corner, boom, boom, boom, boom, boom, boom, boom. And as the bombs were going, people just started running."

~ Paul Lemos.

Note the line of high velocity explosive bursts racing down the side of WTC 1, way ahead of the 'collapse' zone