Waterman says the trouble originated in the building's underground ammunition testing area.
“One of the gentlemen that was downstairs saw a bright flash of light,” Waterman said. “He alerted everyone and pulled the fire alarm.”
Quick reacting employee probably saved alot of lives.
What do you want to bet, unburnt powder in front of the testing firing line, caught fire, starting the cascading effect of this whole catastrophy, seems like I have read several instances of this same scenario.................Don