two devices, not more as first reported and feared. >> all other parcels in the area of the blast have been examined, but there are no unexploded bombs. there were no unexplosive devices found. >> and the two that caused all this, explosives and shrapnel, packed into pressure cookers stuffed into sacks likely detonated by cell phones. also a device a would-be bomb could be found on the internet, crude, deadly and troubling. >> these pressure cook erers ar tactic technique used by the taliban and al qaeda and afghanistan. they pick these pressure cookers up wherever they can, and they use them to make their ieds. >> the investigators are looking at it as an act of terror. any time a bomb is used around civilians, it is an act of terror.