he said he wanted to know how the fbi or the system dropped the ball when they didn't have an interview with tsarnaev when he came back into the united states. a lot of the lawmakers were saying we don't want to monday morning quarterback this. we are not necessarily putting the blame on the fbi. they said they also have some tough questions that they would like to hear some answers to based on this unfolding investigation. don? >> emily snmith, thank you very much. worshippers filled the largest church reflecting on violence that began nearly a week ago. members of law enforcement took part in the service at the cathedral of the holy cross. four large photos of the people killed were prominently displayed behind four lit candles. cardinal o'malley said, in the midst of the darkness of this tragedy, we turn to the light of

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