MSNBC now reporting that the Pentagon is stating that there was only a single explosion. Conclusions are either a bomb or a suicide bomber.
Some Ex-General on FOX News said it was a 122MM Katusha rocket that "got lucky", detonated on the roof of the tent, and showered the 400-some Diners with shrapnel.
Could be... I still have my doubts.
But having 400 personel all packed in to a confined space with apparently NO cover whatsoever within easy mortar or rocket range of an Enemy who lurks just outside the perimeter (assmunig one of 'em didn't sneak in disgused as a "friendly") who has been lobbing ordnance in on you regularly for about a year just seems like incredulous incompetence on the part of someone somewhere in the command structure.
So far according to local news two Members of the 133rd KIA.