AN is not a “high explosive” in the technical sense. It has explosive potential when stored improperly & exposed to fire. Multiple examples have been cited in this thread & elsewhere.
The correct term is blasting agent.
I disagree.
If it is capable of detonating, then, it is by definition a high explosive, and, the multiple examples of it doing so is proof of that.
The fact that pure AN is not used commercially as a high explosive, e.g. because it’s better mixed with fuel oil, does not alter the fact that the pure material itself is capable of detonation.