According to a Saudi who claims to be an engineer and a geophysicist, ammonium nitrate is a signature material for Hezbollah explosives:
#Hizbollah history with using Ammonium nitrate is well known around the world but the goverment of #Lebanon
#LebanonExplosion
#BeirutBlast
source:
https://twitter.com/GAITAMIMI1/status/1290779433310343170/photo/2