Factual error: In some scenes at the climatic fire-fight, you can see that barrels have stickers indicating what's in them. Talking to a Haz-Mat Firefighter, in at least 3 scenes, the labels clearly indicate something that would've fried our heroes in that extreme situation. One barrel that he saw would've exploded because the chemicals label (that he could see; he could be wrong) react to ordinary heat!! Also, since this was a chemical fire, there would've been procedures to "decontaminate" firefighters instead of simply stuffing them into an Ambulance. It's possible that some industrial chemicals could pose a serious risk far worse than any Biological Agent if spread.