Detailed text transcripts for TV channel - KGO - 20130417:10:29:00
And the fbi said, it is looking for a man who was carrying an unusually heavy black bag. >> the bag would have been heavy because of the component believed to be in it. >> reporter: the fbi has other clues in the videos. the white smoke seen after the detonation indicates a bomb built with low-velocity explosive mixtures, not military grade. >> they may not have had the resources as we've seen in other bomb attacks, but they knew how to make the bomb go boom. >> reporter: experts say the large pieces of metal as seen here in the air, suggests the bombs may have been concealed in a mail box or ...
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