In the fifth and final installment of our special limited series Intelligence Matters Presents: Remembering 9/11, host Michael Morell speaks with Gina Bennett, one of the longest-serving intelligence analysts on al Qaeda and other terrorist groups. Bennett and Morell discuss how the CIA first became aware of the work of Osama bin Laden, and how the earliest warnings of al Qaeda's ambitions went largely unheeded. Bennett shares recollections from the day of the 9/11 attacks, including how she and CIA colleagues refused to evacuate headquarters despite being told Langley was a credible target.