According to bin Laden, he didn't:
Additionally, according to the FBI he is not wanted for the attack on the WTC on September 11, 2001. You can check the FBI most wanted page about him.
I have already said that I am not involved in the 11 September attacks in the United States. As a Muslim, I try my best to avoid telling a lie. I had no knowledge of these attacks, nor do I consider the killing of innocent women, children and other humans as an appreciable act. Islam strictly forbids causing harm to innocent women, children and other people. Such a practice is forbidden even in the course of a battle.
http://911review.com/articles/usamah/khilafah.html
Additionally, according to the FBI he is not wanted for the attack on the WTC on September 11, 2001. You can check the FBI most wanted page about him.