“It's not true that no one worries about terrorists attacking chemical plants. It's just that our politics seem to leave us unable to deal with the threat. Toxins such as ammonia, chlorine, propane and flammable mixtures are being produced or stored as a result of legitimate industrial processes. Chlorine gas is particularly toxic; in addition to bombing a plant, someone could hijack a chlorine truck or blow up a railcar. Phosgene is even more dangerous. And many chemical plants are located in places where an act of sabotage - or an accident - could threaten thousands of people.” source...