Taliban
On October 4, 2001, British Prime Minister Tony Blair released information compiled by Western intelligence agencies connecting Osama bin Laden to the Afghanistan's Taliban leadership as well as being the leader of the al-Qaeda organization. The Taliban government gave safe haven to Osama bin Laden in the years leading up to the attack, and his al-Qaeda network may have had a close relationship with the Taliban army and police. On the day of 9/11, the Taliban foreign minister told the Arab television network Al Jazeera: "We denounce this terrorist attack, whoever is behind it."
The United States requested the Taliban to shut down all al-Qaeda bases in Afghanistan, open them to inspection and turn over Osama bin Laden. The Taliban refused all these requests. Instead they offered to extradite Osama bin Laden to an Islamic country, for trial under Islamic law, if the United States presented evidence of his guilt. The Taliban had previously refused to extradite bin Laden to the United States, or prosecute him, after he was indicted by the US federal courts for involvement in the 1998 United States embassy bombings in Kenya and Tanzania. The Taliban deemed eyewitness testimony and satellite phone call recordings entered in the public record in February 2001 during a trial as insufficient grounds to extradite bin Laden for his involvement in the bombings.
Invoking the Bush Doctrine, which stated "We will make no distinction between the terrorists and those who harbor them", the United States and Britain invaded and overthrew the Taliban regime in 2001, using air power, special forces and the Northern Alliance as a land army.
On November 29, 2007, a videotape was released that The Central Intelligence Agency says is likely to be from Osama bin Laden. In it the speaker claims sole responsibility for the attacks and specifically denies any prior knowledge of them by The Taliban or the Afghan people.
Read more about this topic: Responsibility For The September 11 Attacks