This is the story of where the FBI was on September 11th, 2001. This is what they did — and did not — have when it came to counterterrorism and how the tragedy of that Tuesday morning transformed the Bureau. Our guide is Sasha O’Connell, the director of the Terrorism and Homeland Security Program at American University who spent the bulk of her career to this point working for the FBI.

Please note: An earlier version of this episode identified Mohamed Atta’s connecting flight as being from Portland, OR. It was from Portland, ME.

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