Earlier quoted context omitted.
Turns out my cousin's wife got injured in training and didn't run today. They were just there to cheer on some friends who were running. Last I heard they were OK, but, as you can guess, the flow of detailed information in and out of Boston is pretty patchy right now.
SMS seems to be working better than mobile voice.
"A law enforcement official says cellphone service has been shut down in the Boston area to prevent any potential remote detonations of explosives."