No country, to be exact, attacked the US on September 11, 2001. No one, at first wanted to take the credit. However, Osama bin Laden and the terrorist/political/religious group Al Qaeda he is said to have been affiliated with are now credited with the attack. The countries that harbored the terrorists were primarily Pakistan and Afghanistan, but they were not At Fault in the escape of the terrorists from the United States soldiers. They have not found them because of the intense mountainous terrain and vast social network that Osama Bin Laden maintains.
The September 11th attacks, which occurred in 2001, were perpetrated by the al'Qaeda. They are active in Iraq, Sudan, and Pakistan.
Osama bin Laden, leader of the al'Qaeda, is generally blamed for ordering the attacks.
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