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Unexploded ones. theyre hoping to find the bomb makers signature for what remains of these explosives. there is a navy bomb detonation team here helping with the investigation. no surprise. a lot of people on the team telling me it felt like an ied attack seen overseas. barbara star is at the investigation covering this. >> good morning, john. you said bomb signature. what does that really mean? what are investigators focusing on? what we know is, in fact, just as you said, john, after years of ...