The NY Post story is sketchy as fuck and I haven't seen it anywhere else.
A lot of things make me think this could be a domestic terrorist- date (tax day, anyone) and anniversary this week (branch davidians), similar MO to some of the bombings Eric Robert Rudolph carried out in Atlanta (the abortion clinic he bombed was around the corner from my best friend's house, and he used multiple bombs in that attack and possibly others)
Having said all of that, it's stupid and irresponsible for ANYONE to engage in baseless speculation. I'd like to know more facts.