I've seen some massive fires - Hub Oil, Erlton condo, a furniture plant and a roof truss plant - and one thing is usually true: compressed gas cylinders tend to blow when they get wrapped in fire.
Anyway, the plant apparently convinced the EPA that there was "no risk of fire or explosion" in a report. Oops.
http://www.dallasnews.com/news/state...ed-no-risk.ece