The person manly responsible for the attacks was Osama bin Laden. He was a leader of a terrorist group called Al Qaeda. The group's headquarters was a rustic hideout in the country of Afghanistan . After ten-year manhunt, bin Laden was discovered living in Pakistan. On May 2, 2011, Osama bin Laden was killed by SEAL Team 6, a special operations unit of the United States military.
The days after the attacks George w. Bush demanded that Afghanistan's government, run by a group called the Taliban, capture bin Laden and hand him the United States, but they refused. Read I survived the attacks of September 11, 2001.