[Drammach]

well then how could they make the claim it could "kill 20,000 people". two trucks with explosives couldn't do that.

Ask them.. not me.. They made the claim..

Possibly it has to do with location?
If you take the time to read all the various articles, you will realize that the 2 trucks contained the materials not the bombs themselves.
A car bomb was the 1st (only?) actual bomb found.
There was possibly enough materials to make several (dozen?) bombs..

[oceanview]

these VX/Sarin based materials are binary - each base chemical itself is inert, its their combination that makes the deadly toxin. that's why the term "material" is used.