Nowhere it is said in the article that the Hezbollah is responsible for the presence of the ammonium nitrate. Yes they did use it in the past, like almost all terrorist organization/militia, but there is no evidence that they had anything to do with its storage in the port. The AlJazeera article explain very well how it came here.

Rumours of the responsibility of the Hezbollah, or Israel depending on which side of the fence you are, for the blast has been going on since day one, and there hasn't been any substantial proof.

Don't get me wrong, I have no sympathy for the Hezbollah, but lets be honest, the tragedy can be very well explain by the sheer level of incompetence and corruption of the Lebanese government (in which the Hezbollah also plays a big role).

Yes, their mustache-twirling nefarious plot to have large quantities of a relatively stable substance placed in a warehouse in the incredible hope the warehouse might some day also contain tons of fireworks, 10k tires, and detonation cord to set things off.

That link does nothing to support a claim that the ammonium nitrate in Beirut is linked to Hezbollah.

It seems that article only mentions the Beirut explosion in passing?