Claim: The September 11 attacks occurred on September 11, 2001.
Evidence: The September 11 attacks -LRB- also referred to as 9/11 -RRB- The expression `` 9/11 '' is pronounced `` nine eleven ''.
were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States on the morning of Tuesday , September 11 , 2001.