Smugglers!
There is big money and high risks to one owns health and that of others in smuggling many different substances around the world?
Many nations have developed a large amount of chemicals that remain secret and are combined into other things, but the general public will never know what they are!
Britain has another former spy critically ill, but nothing adds up and everything is speculation? But if this is a nerve agent, why the one-hundred special soldiers would this not cause more of a problem than solve a bad one already?
2 Samuel 3:25, Matthew 24:4-5, Revelation 20:8.
Ask me and I will tell you! 