The attack of September 11, 2001 better known as the 9/11 attack is one of the most devastating examples of intelligence failure in the United States. The 9/11 attack pointed out the problems with the international and national security measures implemented by the government of the United States. This attack showed that international terrorism is not as easy to prevent as it seems as despite of having several clues from beforehand, the US security along with the international intelligence agencies failed to identify the risks. One of the major accusations made after the 9/11 attack was made against the intelligence agencies on both national and international level because the report published evaluating the 9/11 attack showed that how it could have been prevented with timely and effective intelligence sharing.