there are scars, but this is part of the strong city, no longer an open wound. and earlier today, more than 4,000 people, singer james taylor included gathered to remember a fallen mit police officer. murdered the suspect fled last thursday. vice president biden was at the service calling the bombing suspects twisted, perverted, cowardly. what did authorities here and there know about the pair, especially the older one who travelled to russia last year for six months and was on the radar of russian intelligence a year before that. breaking news tonight from nick walsh and joe johns and gloria borger. joe, we start with you. the older brother was flirting with extremism, now you're hearing the cia was approached later that year by the russians. what happened? >> that's right. the cia nominated him.