As best I can tell there was no advance warning of the attack on the World Trade Center in 1993, which was the first significant foreign terrorist activity in the U.S. No tip-offs that it was coming.
-- Bobby Ray Inman
   
Bobby Ray Inman   Name:
Bobby Ray Inman
Type:
Soldier
Nationality:
American
Birth:
April 4, 1931
https://www.nutquote.com/quote/Bobby_Ray_Inman