[Pern]

Investigators were trying to determine what ignited the blast.

My guess would be a cigarette or a joint. My dad works for a petroleum co. here in La. Those huge tanks are built tough, no way they could have punched a hole in it, even with a rifle. There must have been a leak at the vent fitting on top.

[MEG33]

How about a spark from a shoe tack+ fumes.

[Pikachu_Dad]

Those tanks are designed to breathe.

So yes, there would be some level of fumes on top of the tank.

My gut tells me that this was a smoke break with a very bad location chosen to do it.

[sinclair]

Happy Second Anniversary of FReeping.