Boy, that really disassembled that building!
It's hard to see how you can have a fire, and
then a huge gas explosion. I suppose it's possible, but sounds strange.
Dust explosion ignited by a fire just sounds more likely.
The danger of dust explosions reminds me of how everybody forgets about masses of ammonium nitrate until some lets go. I seem to recall somewhere about a dust explosion due to the to activity of cleaning it up. I can see a small fire (gas leak?) igniting a dust cloud. Anyhow, speculations aside, I'd be interested in a definitive cause.
I feel bad for the human loss. In some explosions, i.e., Beirut, corpses are never found.
Beirut crater; 2,750 metric tons of ammonium nitrate:
