All the evidence I've seen indicates that the attacks of Tuesday, September 11, were made by citizens of Egypt and Saudi Arabia. Bin Laden is a citizen of Saudi Arabia. His father was a Saudi Arabian captain of industry, and his family fortune is Saudi Arabian. I have read unsourced, unattributed accounts that indicate that Bin Laden was in close contact with the recently released head of Saudi Arabian security. We have all seen, or read about, the citizens of Egypt cheering the attacks.
As sad as it is to admit, it appears that these attacks were not made by those we consider to be the usual suspects, namely the governments (or citizens) of Syria, Libya, Iraq, and Iran. Rather, all indications are that these attacks were made by the people of Egypt and Saudi Arabia.