day care center, investigators suspected terrorism. a suspicion that only grew stronger when they realized that this bomb might well be related to another unexploded bomb found two weeks earlier lying in the street just blocks from the hoagland's house. >> this is a device we had not seen in the united states. >> detective chris evert and bomb squad commander john wood had taken that earlier call. between them, they've investigated and disarmed hundreds of explosive devices. but this one was a first. >> these particular devices had only been seen in war countries, afghanistan and iraq. >> the small but powerful device was hidden in a fed-ex envelope, but what really got everyone's attention was the detonator linked to a cell phone. and that to you says what? >> this is somebody that can build a bomb and it can sit