September 11 Terrorist Attacks

**Definition:** Terrorism on September 11, 2001 against targets in New York, the Pentagon in Virginia, and an aborted attack that ended in Pennsylvania.

**Tree numbers:** - I01.198.240.856.800.750 - I01.880.735.950.250.860 - K01.400.504.984.500

**Synonyms:** - September 11 Terrorist Attack - September 11 Terrorist Attacks, 2001 - World Trade Center Attack, 2001 - 9-11-2001 Attack