There was just the Bhutto verbal slip, that many thought was simply a misattribution, that may have precipitated the violence.
It's all we have to go on, but there are at least a couple of more kinks in the story, reported by no less than The New York Times and FOX itself in 2002.
People have been starting to notice some funny things. If he's dead, and the Administration really did know about his death in 2002, that would be an awfully embarrasing fact to come out in an election year. Then there's the tinfoil question of whether or not the Pak secret police really killed him- and assumed control of Al Qaeda operations.
That being the other statement of Bhutto's that you can't write off as a simple misattribution.