While there may have been a plot — or at least talk of it — one really has to question whether it was feasible. The amount of explosives required would be huge; and the time and effort required to accomplish it would make the preparations rather obvious.
I really have no idea about what it takes to blow up a dam, but this whole story just adds to the out of control border situation. I’d rather not wait until someone successfully pulls off an attack.
Recently, TX authorities were warned to watch out for terrorists after the Feds caught a ring leader smuggling Somali’s from South America up to Texas.
My impression is that the Zetas are a bit short on Civil Engineers.