bombings, dzhokhar tsarnaev was back in school living the life of a normal kid. tamerlan was a boxer and well-known and been in this community for awhile. he was sort of the more riggarious of the two. you look at the tweets and tweeting and making references to the bombing talking about the city and the impact on the city. >> we have a press conference now about to begin. the fbi and local authorities in boston. >> i'm going to make a couple comments and turn it over to rick who is the special agent in charge of the fbi's office here. the city of boston is open and will be open tomorrow, but it will not be business as usual. it will be a heightened law enforcement presence consistent with the severity and seriousness of the on going investigation. >> the device at the jfk library was actually a fire. we haven't linked that directly to this incident. right now this incident consists