Declassified 9/11 briefs show repeated US warnings on bin Laden threats

Here are five key takeaways from the files.

The newly released collection shows that warnings about bin Laden's intentions were not limited to the months immediately before 9/11.

A July 1998 brief was titled “Reports That Bin Ladin is Planning Attacks Inside the US.” Other documents warned about potential attacks against US interests and bin Laden's plans involving unconventional weapons.

The CIA also documented bin Laden's growing terrorist infrastructure in North America, with a September 1998 brief titled “Bin Ladin's Infrastructure in North America.”