The storage and production is highly regulated. Every suspicious event must be communicated with the "Nationaal Coördinator Terrorismebestrijding" (coordinator counterterrorism).
I would hope that every person in any type of supervisory role over a warehouse took this as an opportunity to say "Oh f*ck I need to make sure my warehouse isn't next"
Well, if you remember the horrible port explosion in Tianjin, it seems not unlikely, China is a major exporter to Europe. The west probably has better site safety rules and hazmat regulations in place, though.
I do start to wonder if any of such materials are stored like this in one of our ports, such as Rotterdam, The Netherlands.
I can't imagine such a mess to exist there.
But The Netherlands remembers the Firework explosion in Enschede, from 2000. https://en.wikipedia.org/wiki/Enschede_fireworks_disaster
It's not nearly at the scale of Beirut, but it killed 23 people.