What good is a terrorist attack if (a) nobody knows you did it and (b) you never repeat it (I.e., not a dry run.)?
What kind of terrorists don't contact media and everyone else under the sun and make sure they know that they did it.
Al Quada, would have been harping on this, as most groups would have by now.
There are just to many reasons (now, not then) to believe this wasn't a missle attack or a terrorist attack.