CNN CNN Newsroom April 16, 2013 15:09:00
Right now i want to bring in barbara starr. barbara, you just got some new details on this investigation. what have you just learned? >> well, john, we now know that about 1,000 national guard massachusetts and from other new england states assembling on scene to support local law enforcement and help them out. people have been talking about this as a war zone. literally, john, the u.s. military intelligence working with the fbi, they have years of experience together now from the wars in iraq and afghanistan on assembling the forensics of bomb explosions. what they are looking at is how this ...