I read the two guys planned on a 4th of July bombing...and discussed a suicide pact as well...but when the bombs were made early, they decided to bump up the date. Hence,Boston.
The remaining one needs to be put to death after he is done talking. The two who helped him..or three...and the wife where the bombs were made...all need to follow along behind him.
JMO
She may not have known. God only knows what guys get up to in their workshops in the garage in the evenings, you know? Also, he had all day to work: I read she was working up to 80 hours a week as a home health aide and totally supporting him: he was an unemployed loser. Gals? NEVER NEVER NEVER get involved with a man without a job!!!!! It's like getting involved with a man with food issues, only much worse.
So he was presumably making bombs while she was gone. Until there is evidence involving her, I don't believe she knew about it. It would be easy to hide bombs made like that.