I am strongly tempted to go ballistic now, but I will give the cops a chance to examine the evidence here first. One major argument against this being what it looks like is that assassinating dissidents on American soil is something that the KGB was hesitant to do during the height of the Cold War; if the Iranians think that they can get away with something similiar then they are going to get an unpleasant surprise. Yes, even under Obama: it’s the weak ones that you have to worry about when it comes to this sort of thing. They’re peculiarly vulnerable to disproportionate – or at least very explosive – responses.
But it may have just been a coincidence.