dc0de wrote:

...The Chlorine Institute, a trade group that represents more than 200 companies that make and distribute chlorine, recently alerted the FBI to several thefts or attempted thefts of 150-pound chlorine tanks from water treatment plants in California...

...There is no intelligence indicating such an attack is imminent or that terrorists have stolen any chlorine from the nation's chemical or water treatment plants, which use chlorine to purify drinking water...

Err, am I the only one confused by this article?

Why isn't anyone looking for Liquid Hydrogen, Liquid Oxygen, and other liquid/gas explosive vehicles as well? one would think that a tanker truck full of LOX would make a very nice smoking hole in the ground.

Well, for one, they may well be, but the major reason I can think of is that those other chemicals you mentioned may help you make a large boom, but they're not as terrifying as Chlorine, a cloud of which can drift around suffocating a lot of people.

There was some brief concern, post 9/11, that some large Chlorine tanks on long island (i think) could be attacked, causing a huge gout of the stuff to wend it's way through NYC causing respiratory failure and damage in thousands. I don't recall anyone's assessment of practicaility, but it makes sense that smaller tanks of the stuff could still be pretty scary.

RE: Chlorine bombs pose new terror risk - USATODAY.com