The September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda against the United States on the morning of Tuesday, September 11, 2001. The attacks resulted in 2,977 victim fatalities, over 25,000 injuries, and caused at least $10 billion in infrastructure and property damage.  Additional people have died of 9/11-related cancer and respiratory diseases in the months and years following the attacks.