Bombing of New York military recruitment center, letters showing same military recruitment center with a sign saying "We did it" a big coincidence. I think it would make the police's job much easier if they would simply decide that the world is full of coincidences.

I got to wondering, though I was pretty sure it wasn't, if it was possible that this was the military induction center from the song "Alice's Restaurant." Turns out that building was itself bombed in 1969.