WASHINGTON (CBS)—A manhunt is underway for a traitor inside the Central Intelligence Agency, CBS News has learned.

The  CIA and FBI are reportedly conducting a joint investigation into one of the worst security breaches in CIA history.

CBS News reports that the alleged traitor exposed thousands of top-secret documents that described CIA tools used to penetrate smartphones, smart televisions and computer systems.

Sources say authorities are looking for an insider—either a CIA employee or contractor — who had physical access to the material.

Read more on CBS News.

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