It seems the way anything bad that happens in the world some Islamic group claims credit for it. You would think Al Qaida would claim credit for it to show us Americans how weak we are and how they can touch us at anytime; blah blah. But has anyone with Al Qaida claimed that? Hm, I would think OBL would.
That has never been his style. Recall that they did not claim credit for 9/11 either. I think that is one thing that is unique to AQ when it comes to ME terrorists.