Interesting - Hezbollah and ammonium nitrate

Seems that they had caches of it around Europe - from The Jerusalem Post:

Hezbollah stockpiled chemical behind Beirut blast in London and Germany
Hezbollah kept three metric tons of ammonium nitrate, the explosive thought to be behind the mega blast in Beirut this week, in a storehouse in London, until MI5 and the London Metropolitan Police found it in 2015.

The Lebanese terrorist group also stored hundreds of kilograms of ammonium nitrate in southern Germany, which were uncovered earlier this year.

More at the site.  There is still too much missing information. NH₄NO₃ is the oxidizer, it still needs the fuel (such as the fuel oil or diesel in ANFO).

Still way to early to know what really happened.