The For Public Disemination description of what blew is likely BS.
Nitrate fertilizer does not just blow up on it's own.
Several other things are required to cause that to happen.
My money says rocket fuel, munitions and other explosives intended for use as terror weapons were responsible.
Can't help but wonder if some our Israeli friends might have helped things along?
Tell that to the people in Galveston Texas especially the ones that were around in 1947 when a French ship with 2,300 tons of it went up. 581 died.
Ammonium nitrate does not burn on its own.
Instead, it acts as a source of oxygen that can accelerate the combustion (burning) of other materials.
For combustion to occur, oxygen must be present. Ammonium nitrate prills provide a much more concentrated supply of oxygen than the air around us. This is why it is effective in mining explosives, where it's mixed with oil and other fuels.
But
At high enough temperatures, however, ammonium nitrate can violently decompose on its own. This process creates gases including nitrogen oxides and water vapor. It is this rapid release of gases that causes an explosion.
Ammonium nitrate decomposition can be set off if an explosion occurs where it's stored, if there is an intense fire nearby.
The initial problem was a fire nearby and that is why the ammonium nitrate went off. Plus, being stored in a poorly ventilated container in a place that has an average temperature of near 90 this time of year. Let is set and decompose then have a fire near it and you have a unplanned explosion, just like the one in Galveston Texas
Now, did someone know the fertilizer was there and set off the chain of events? Possible.