But that's just me guessing.
Everyone at home is really shook up, as one might imagine. Happily, my friends running had either already finished the race, or were stopped in Newton. But everyone there is really freaked out about this, understandably. I think - and this is just me trying to remember my history, so I could be incorrect - that the last terrorist bombing in Boston was in the early 1900's, around the time of WW1, when anarchist activity there was quite high. So it's been generations since the city was last targeted like this.