Or could it be that another country outside the Islamic world would want us to think this?
Although I do not have all the facts about Tuesday's attacks, the preponderance of evidence certainly seems to point towards Osama, or at least towards Islamic fundamentalists of unspecified affiliation. At this point, I would have to say that Islamic fundamentalists are THE enemy of mankind and it doesn't really matter by which acronym they are known.
If you are referring to the possibility of non-Islamic involvement, the only way I could see that entering into the picture is if some foreign intelligence sources had crucial information which they chose not to disclose to us. If these un-named parties did conceal information because the provocation of an international crisis was in their best interest, then they are certainly guilty of being accomplices to a war crime. But that is almost after the fact. The prime culprits are those who did the deed, not those who might benefit from it.
Governments have a long history of deceiving their populations in order to create a frenzy for war. This seems to be especially true in the Anglo-American Sprachraum. I do not believe that it is true in this case, however.