Read your post again.
Folks if you see a gallon jug, run like the devil is after you.
I would think that is what the jugs in the subways were!!
Call them water if you want.
They may have been the real thing, or of course it is possible that they were checking the timing of placing them.
How were they going to release them? Maybe with a few bombs, so the stuff exploded.
Or with the explosive wrapped around the jugs.
Some where there is a terrorist, acting as the time keeper and he can tell you exactly how long it will take to set it up.
Not hard to get the chemicals in, as they have stolen the tanker trucks and the different fertilizers for months now.
You have a great memory Ruth. You make me wonder how they will coordinate this if they can't use cell phones or other means of communication. Unless, of course if they have it all planned already and all it takes is one word by phone or on the internet. There is a long post on Jill's site where they are complaining that some of their websites have been closed and how they plan to get around that.
So in addition to the suitcases which may be diversions, we have the bottles in the subway, the leaking trucks and trains. The derailments, the rocket launchers, the divers.
I would think if it's a placement of an object it would have to be rehearsed ahead of time. You would have to watch for security and their schedule. The times of the trains etc.