>>125251541&3 are the most probable. I was in some of those breads ATT. No-Scintillation, massive stockpiles of Ammonium nitrate...Truly is as likely that habeeb wasn't careful enough on his smoke break. Or could've been an easy sabotage.
I don't think it was a nuke though. There have been houses that have filled up with natural gas and exploded with pretty amazing effects. Scale that up to 3-400X and it's not hard to imagine.
I was under the impression that OPs point was the memory holing---but then shouldn't we be used to that by now?