scary stuff. I'm glad I don't live down there anymore. You guys that do be careful!
The refinery scenario would also be consistent with several other things.
When AQ discussed sabotaging the refineries in Saudi Arabia years ago, they noted that in the process of refining oil, a chemical is used which- when ignited- would cause a very lethal chemical weapon.
Also, on some of their threats about their plans, they have written "breathe deeply when the time comes- it will be easier that way."