The release, made on the 25th anniversary of the 9/11 attacks, includes never-before-seen documents that the CIA had sent to both former presidents. The briefings detail what the intelligence community knew about Al Qaeda's intentions and capabilities in the years and months leading up to the attacks.
The CIA described the tranche as comprising 71 declassified documents. The agency did not provide further details on the specific contents of each briefing, but the release marks the first time these particular intelligence products have been made public.
The documents cover the period when both Clinton and Bush were in office. The briefings were part of the President's Daily Brief (PDB), the most sensitive intelligence summary provided to the commander-in-chief. Some of the briefings reportedly included warnings about Al Qaeda's desire to strike inside the United States.
The decision to release the documents comes after years of pressure from families of 9/11 victims, historians, and transparency advocates who have sought greater public access to pre-attack intelligence assessments. The release may help answer lingering questions about what senior officials knew and when they knew it.