If true, this is fairly remarkable. A variety of domain names were registered, as early as June 2000, such as:
“attackamerica.com,”
“attackonamerica.com,”
“attackontwintowers.com,”
“august11horror.com,”
“august11terror.com”
“horrorinamerica.com,”
“horrorinnewyork.com,”
“nycterroriststrike.com,”
“pearlharborinmanhattan.com,”
“terrorattack2001.com,”
“towerofhorror.com,”
“tradetowerstrike.com,”
“worldtradecenter929.com,”
“worldtradecenterbombs.com,”
“worldtradetowerattack.com,”
“worldtradetowerstrike.com,”
“wterroristattack2001.com.”
Thanks to Quiddity for this one.