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It's a discretionary day of remembrance designated in memory of the 2,977 casualties in the September 11, 2001, attacks.
In total 3,497 people died in the attacks on 11 September 2001. 2,740 Americans Died in the September 11 attacks.
The September 11th attacks occurred on September 11, 2001.
The 9/11 attacks were on September 11, 2001.
Tuesday, September 11, 2001 was the day of the attacks.