When asked why there is no mention of 9/11 on Bin Laden’s Most Wanted web page (30), [Rex Tomb, Chief of Investigative Publicity for the FBI] said, “The reason why 9/11 is not mentioned on Usama Bin Laden’s Most Wanted page is because the FBI has no hard evidence connecting Bin Laden to 9/11
http://www.fbi.gov/wanted/topten/fugitives/laden.htm