If true, not evacuating is inexcusable. Likewise, with not turning off the gas to building 2. Would have lost some production, but better than the entire structure blowing up plus damaging building 1 too.

WFMZ 69 coverage is decent, but notice they've been disabling comments on some of the related articles. Maybe afraid of ruffling the wrong feathers. That's the issue with small-time news media. Trust WPVI 6 and WGAL 8 coverage more along with posts here on Reddit from people actually involved, but I digress.

In time the truth will come out. Most likely a natural gas leak, but could have been more complicated than that. Maybe a boiler explosion due to some fault releasing gas to atmosphere, which would have similar results.