I’m surprised that there is anything of that grain silo building left standing at all.
I read that it held 85% of the nation’s grain supplies at the time. (And Lebanon imports almost all of their grain.) What’s left in the building is no longer usable.
Terrorists could easily have used that stockpile and triggered it with a small explosive device.
It’s obvious there is an initial incendiary followed by a large fire, a series of smaller explosions and then one massive explosion as the entire stockpile erupts.
It’s remarkably well intact bu with the amount of reinforced concrete and steel it’s really not surprising.
In some of the after photos I’ve seen though it appears the foundation may be compromised and that it’s leaning several degrees away from the force of the blast.
It appears it just helped to focus the blast back out across the harbor and inshore in about a 200 degree semi circle.