The bags supposedly stored in that warehouse show labelling of Nitroprill HD:
Which apparently is a Brazilian knock off of Nitroprill made by these guys in Aus: http://www.oricaminingservices.com/down ... _id_21273/ and which is specifically intended for explosives.
Seemingly, the stuff designed for agricultural use are high density prills (https://www.cropnutrition.com/resource- ... um-nitrate), whereas this stuff is a low density prill, i.e. the kind used in industrial processes / specifically for explosives. That is assuming the knock off is the same as the original but why pass off your product as a trademarked version of an explosive if your touting fertiliser?
Nothing to suggest that the story around this material being confiscated from a boat several years ago is false, however, it seems more likely that what they confiscated was intended for use as an explosive in a part of the world riddled with terrorism. I doubt you buy stuff specifically designed for explosives to then use it as fertiliser...
If you want to go one step further, the small pops and bangs supposedly 'fireworks' at the outset of the disaster also may well have been small arms and other confiscated munitions which I presume would look similarly as they detonated in the heat of a blaze but clearly we are not likely to know now the whole area has been vapourised!
ETA: This interesting excerpt from an article written by a legal firm in Beirut in relation to the confiscation of the goods suggests it was on route to Mozambique so perhaps not intended for local terrorism but still likely for explosive use and not 'fertiliser'. The cargo parties also losing interest in the goods and abandoning them slightly odd too...