Not sure if this has been covered, but in 1947 there was an almost identical disaster as the one in Beirut, about 2300-2500 tons of ammonium nitrate exploded and is still considered the worst industrial disaster in US history
The similarities are uncanny, and I have to say I don't think anything but the ammonium nitrate was exploded in Beirut
Fertilizer explosion kills 581 in Texas
A giant explosion occurs during the loading of fertilizer onto the freighter Grandcamp at a pier in Texas City, Texas, on April 16, 1947. Nearly 600 people lost their lives and thousands were injured when the ship was literally blown to bits.
Ammonium nitrate was used as an explosive by the U.S. Army in World War II and, after the war ended, production of the chemical continued as its use as a fertilizer became accepted. However, the precautions used in its transport became far more lax in the post-war years
Some water and an extinguisher were used to fight the fire, but hoses were not employed for fear of ruining the cargo; there were already 2,300 tons loaded on the ship. While the ammunition was removed from the ship, the crew attempted to restrict oxygen to the hold in hopes of putting out the fire. Apparently they did not realize that because of ammonium nitrate’s chemical composition, it does not require oxygen in order to burn.
By 9 a.m., flames had erupted from the hold and within minutes it exploded. The blast was heard 150 miles away and was so powerful that the ship’s 1.5- ton anchor was found two miles away. The force of the explosion lifted another ship right out of the water. People working at the docks were killed instantly.
In all, 581 people died and 3,500 were injured. The explosion caused $100 million in damages. A long-disputed court case over the cause of the blast was resolved when Congress granted compensation to 1,394 victims. They received a total of $17 million in 1955. The port was rebuilt to handle oil products only.
https://www.history.com/this-day-in-history/fertilizer-explosion-kills-581-in-texas
https://en.wikipedia.org/wiki/Texas_City_disaster