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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 right now? there are so many question marks. >> and there remain a lot of questions, erin. we know ...