[CatOwner]

"It has happened from time to time."

True enough, but it wouldn't surprise me in the least if this was the work of some eco-terrorist or anti-oil nutcase.

[EaglesUpForever]

I would think it far more likely, IF it is terrorism of any sort (and it's probably just another accident, the oil refineries around here have many many such accidents), it would be more likely Al Qaeda than "eco-terrorists".