So, as far as this attack goes, seeing as how noone claimed responsibility or claimed a specific means as to why they did it (politically or otherwise) it is not "Terrorism" it was a Bombing, A "Senseless act of violence". Terrorism,Terrorist,Act of Terror,etc. are all buzzwords that get you to keep watching as they paradearound the story for three weeks. I dont even think the original description was provided by the FBI. The dark-skinned foreign sounding hooded guy was probably something made up by the media to further feed your need to watch.
The 9/11 attacks and the jihadist extremists that committed them are one form of terrorism. Those attacks where political statements and meant to strike fear in that form. And the important part of that, it was reinforced and claimed as such.
Martyrdom in itself is a "terrorist act". It is the sacrificing of ones self for a belief or idea.
Until this was completely fleshed out and every detail was discovered the words "terrorism" should have been words spoken only by POTUS or Homeland Security. The FBI official who started this *** ought to be fired for that bit of professional idiocy. It should've been addressed as a Bombing,serial bombing,"senseless act of violence" or any other words other than something terrorist.
edit: and only by POTUS and Homeland Security i mean in secret,behind closed doors,in private.