Sears Tower Profile: Sears Tower Events (3) (After 9:59 a.m.) September 11, 2001: Richard Clarke Orders Securing of Buildings, Harbors, and Borders 2001-09-11 October 16, 2001: Several Israelis Arrested for Curious Sears Tower Surveillance 2001-10-16 Spring 1998: Experts Warn FAA of Potential Massive Kamikaze Attack