TARGET: AMERICA.

Presents a look at what investigators have discovered about al-Qaeda's plans for its next big attack on the U.S. How arrests by U.S., Pakistani and British investigators has unearthed new clues about possible terrorist attack plans; Surveillance of buildings by al-Qaeda operatives inside the U.S., beginning in 2000; How the operatives kept their attack plans a secret from the U.S. government until July 2004; Why there remains cause for concern; Escalating fears that al-Qaeda may attempt another 9/11-size attack in the U.S.; Efforts of law-enforcement and intelligence agencies to find al-Qaeda sleeper cells worldwide; Worries that Osama bin Laden may have ordered another attack; Question of how many terrorists are still at large; Background on the arrest of Pakistani Musaad Aruchi, nephew of Khaldi Sheikh Mohammed; Decision of Homeland Security Chief Tom Ridge to publicize the names of the targeted buildings; Security measures.