Grade Explosive News Today

Thousands of people are going about their work today. but it is not business as usual by any means. about 15 blocks of this downtown area shut down. a crime scene now patrols by national guards. this is whats happened since you went to sleep last night. we mentioned that 8-year-old richard martin among the three people killed. our boston affiliate whth reporting that his mother and 6-year-old sister also among those injured. as chris said the sister losing a leg. the mother having surgery overni...

This a terror attack, what goes into a definition like that? >> reporter: well, theres no question that it was a planned, coordinated attack intended to cause causalities. the point about this being small 5: packages, wolf, were fortunate there would have more greater causalities if the packages themselves had been larger. while we know there are causalities and thats tragic, its fortunate that this wasnt either a higher grade explosive or a larger device, which would have caused more causalitie...

And injury and death tonight and authorities in boston are combing the city trying to get clues to help them find the person or people responsible for the deadly terror attack today. the fbi, atf, state police are all involved in the investigation. president obama vowed to find out who did this but at this moment there are no suspects in custody. "outfront" tonight, former fbi assistant director tom fuentes and fran townsend. what is the latest can you tell us from your reporting of what we know...