WHAT HAPPENED IN BEIRUT?
This article points out a pattern of behavior that may or may not be in play in the Beirut explosion. Storing that much Ammonium Nitrate for that many years is, IMO, suspicious.
I've been applying Hanlon's Razor to this one.
Hanlon's razor is an aphorism, "Never attribute to malice that which is adequately explained by stupidity", known in several other forms. It is a philosophical razor which suggests a way of eliminating unlikely explanations for human behavior. Similar statements have been recorded since at least the 18th century. It is probably named after Robert J. Hanlon, a person who submitted the idea to a joke book.
I think the Lebanese just crammed an entire cargo hold of a ship they confiscated from Russia into a warehouse, then simply forgot about it. Envision the final scene of
Raiders of the Lost Ark.