On August 24, 2001, future 9/11 hijackers Khalid “Almihdhar and [Nawaf] Alhazmi were placed on the TIPOFF watchlist, alerting INS [Immigration and Naturalization Services] in case they tried to enter the country. By then, they had already been here for nearly two years.”
– James Bamford, A Pretext for War, Pages 244-245