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But there are no unexploded bombs. there were no unexploded explosive devices found. >> and the two that caused all this, explosives and shrapnel packed into pressure cookers stuffed into sacks likely detonated by timers, not by cell phones. also, a device a would be bomber could find on the internet. proved deadly and troubling. >> these pressure cookers are a technique that is used by the taliban and by al qaeda in afghanistan. they're very effective weapons, they try to pick these up wherever they can. they use them to make their ieds. >> the fbi is investigating as an act of terrorism. any...

Stuffed into sacks likely detonated by timers, not by cell phones. also, a device a would be bomber could find on the internet. proved deadly and troubling. >> these pressure cookers are a technique that is used by the taliban and by al qaeda in afghanistan. they're very effective weapons, they try to pick these up wherever they can. they use them to make their ieds. >> the fbi is investigating as an act of terrorism. any time bombs are used to target civilians, it is an act of terror. >> reporter: terror, he went on to say, murder, maiming, traumatic amputations by persons unknown, nationalit...