Patriot Day is a day of remembrance to those who died during the 9/11 terrorist attacks in New York City, at the Pentagon and on United Flight 93 in Pennsylvania.The day has also been designated as a day that the U.S. flag should be flown at half-staff from sunrise to sundown, not just until noon as is done on Memorial Day.
The September 11 attacks were a series of four coordinated terrorist attacks by the Islamic group al Qaeda against the United States on the morning of Tuesday, September 11, 2001. The attacks resulted in 2,977 fatalities, over 25,000 injuries, substantial long-term health consequences, and $10 billion in infrastructure and property damage. 9/11 is the single deadliest terrorist attack in human history. It is also the deadliest incident for firefighters and law enforcement officers in the history of the United States.