[Myrddin]

How can the infidels (us) "not know until it is too late", yet something will happen "while the world watches in horror".

A low dose of sarin or VX could take 20 minutes to have full effect. There would be no way to treat a stadium full of people fast enough.

[Domestic Church]

From the CDC...an attack scenerio:

http://www.cdc.gov/ncidod/EID/vol5no4/otoole.htm