Somebody check U-Haul, Ryder van rental requests for this week.
There was also the high school kid that made the comment about the towers not being around in a weeks time, or something similar.
There may be nothing to this warning, but dismissing it out of hand is foolhardy. We've probably stopped more attacks than we'll ever know. Remember, few took Bin Laden seriously when he called for Jihad against America. He was, after all, just another crazy muslim spouting nonsense.
Some crazy he turned out to be. Best advice is just to be aware, I suppose.