September 11th

On the first reference, use terrorist attack on Sept. 11, 2001. On subsequent references, use September 11th with the month of September spelled out. Do not use 9/11, as some screen readers may read this like 9-1-1, or Sept. 11, abbreviated like a date style.

For related places or events with proper names, such as the National September 11 Memorial and Museum or the September 11th Victim Compensation Fund, follow proper name style.

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