The documents illustrate security analysts’ tracking of bin Laden’s movements and support system, as well as concerns about possible threats to U.S. targets.

CIA declassifies presidential briefings that trace al-Qaeda threats to hijack plans and target US cities before 9/11

A September 10, 1998 brief — parts of which have been redacted — says that Al-Qaeda “may fly an explosive-packed aeroplane into a US city”.