What that video shows is that the ammonium nitrate is on the south side of the warehouse (closest to the camera) and the fire started on the north side working its way down to it.
https://www.firerescue1.com/disaster...4P4SPn7er5lwY/
It auto-ignites at 300C...
Quote:
Ammonium nitrate may explode, especially when subjected to confinement or high heat, but it does not readily detonate.
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Advise for firefighters is to evacuate everyone from the "hot zone."
It was a subsonic blast...that's why it looks the way it does in the videos.
So...what I think happened is that something started a fire on the north side and it worked its way south, reaching 300C. This is what caused the "fireworks." It was actually ammonium nitrate reacting...but being lifted as it reacts by the heat which leads to the small explosions in the air. Eventually the fire got hot enough that one of those small explosions happened among the rest of the ammonium nitrate, and that detonation was sufficient enough to initiate the chain reaction throughout the rest of the ammonium nitrate causing the roughly 1.1 kt blast.
The only question is whether or not there was malice in the original fire at the north end of the building: was it an accident or was it intentional?