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I didn't know you'd retired!
(Seriously though obviously I bow to her actual knowledge of the subject).
From the BBC this morning:
President Michel Aoun said 2,750 tonnes of ammonium nitrate had been stored unsafely in a warehouse for six years.
Reminds me of this but bigger:
https://en.wikipedia.org/wiki/West_Fertilizer_Company_explosion
This retired nuclear scientist and chemist says the red cloud is indicative of ammonium nitrate: