The only thing that doesn't fit is that typically the goofy mooselims seem eager to take credit for this type of terror activity. So far, no one has claimed credit.
Just hope they catch whoever it is.
Actually, from what I have seen, the only ones making any claims to terrorism are the Palestinians. I do not recall Al Queda taking credit for anything that they have done to date. I am not saying that is is Al Queda, only that the lack of "credit-taking" does not rule them, or some group like them out.