I haven't heard anything other than that the police have a suspect based on surveillence camera stills, but the only development that would surprise me would be that it was the IRA. I understand how my first comment could have been taken in a partisan context (and I definitely replied to its subsequent reply that way), but I meant my original post in the broader sense that it could have been an act of terror aimed at a political ideology in general, IOW, the possibility of domestic terrorists equally motivated at striking out against the "Northeast big government liberals" as jihadists trying to inflict mass casualties at an international event in the 'land of corruption.' I also have no doubts that Saudi oil money could cover nearly ANY sin on American soil. The last time Saudis attacked the US, the US attacked Iraq.
I'm happy to see that the public and government has refrained from accusatory bloodlust for the most part. Not so many years ago, the flags would have come out and the American people would be given the name of some remote Middle Eastern country and rallied to level it and sny who questioned why would have been labeled unpatriotic traitors. Eleven years of war has hopefully dulled that reflex. I don't want my tax dollars killing another few hundred thousand brown people who had nothing to do with this.