"Good question, my mind leans toward .."
Well, my mind is open to all possibilities. The last thing I want is a paper trail on the internet of me jusmping to some erroneous conclusion before there's any verifiable evidence. But, hey, that's just me.
Detectives work on hunches all the time in order to pursue further knowledge that either works with their theory or rules it out. The events mentioned by eyewitnesses so far cause me look for evidence that rules out a terrorist act. I haven't found it yet. Until I find the something to undermine this as a terroist act, then it we'll remain a working theory. I'm simply "tapping the stone" to find the cracks.