Unless PA's regs are wildly different, I don't think that ciggies, stoves, sources like that would be an issue. Unless staffing wasn't up to snuff. Wiring might still be an issue, especially in an older building. But starting in a memory wing...that really concerns me.
Some of the early police scanner chatter mentioned an explosion (according to a fire police friend). No mention of it in any of the news articles, though.