CIA Declassifies Pre-9/11 Intelligence Files

The CIA has released dozens of declassified documents about Osama bin Laden and al-Qaida from before the September 11 attacks. The files show that both Bill Clinton and George W. Bush received repeated intelligence alerts about bin Laden prior to 9/11. One warning, issued three years before the attacks, mentioned an 'explosive airplane' threat. The release offers new insight into what the US knew before the attacks.