A Couple Of Good Questions

SEE HERE Gee what could be wrong here? ... Hmmm... midnight visits to the water supply of a major U.S. city.  Anyone explore the possibility of introducing biological or chemical agents into the water which would create devastation?  Just what are the backgrounds of these folks and what equipment, if any, were they carrying?  How many groups like this are in the country?  You don't suppose they could be up to no good do you?