CBS News has learned that a manhunt is underway for a traitor inside the Central Intelligence Agency.
The CIA and FBI are conducting a joint investigation into one of the worst security breaches in CIA history, which exposed thousands of top-secret documents that described CIA tools used to penetrate smartphones, smart televisions and computer systems.
Sources familiar with the investigation say it is looking for an insider -- either a CIA employee or contractor -- who had physical access to the material. The agency has not said publicly when the material was taken or how it was stolen.