According to today's St. Petersburg Times, four men described as "Middle Eastern" tried to buy an ambulance, two former police cruisers, and an old truck from St. Petersburg College this summer. The men have since disappeared.
This sounds like pure Rovian PsyOps - in a swing state, in the home stretch, with his guy losing, fake a terrorist plot to get everyone's mind off of what a loser Bush is.
Link to story
[update]
This doesn't pass the smell test, and Kossacks (and Dem surrogates) should be ready immediately to talk to the media if this story actually breaks.