ABC withholding a tape concerning a terrorist attack? Sounds like they are trying to sway people to vote for sKerry.. because they know that would let people know the threat is REAL.
"Dear pig dog Americans! We will continue to be a nuisance to you in the future! Oh, and maybe kill a few tens of thousands of you. Very nuisancy, no?"
I imagine they also have witheld it from DHS and the FBI, citing "Journalistic Integrity" to protect their source.