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Top Secret America: 9/11 to the Boston Bombings

9 pm Tuesday, April 30, on WILL-TV's Frontline: Watch a preview.

Makeshift memorial for victims near the site of the Boston Marathon bombings.

Makeshift memorial for victims near the site of the Boston Marathon bombings.

In the wake of the Boston Marathon bombings, Americans are asking why the country's intelligence agencies failed to prevent the devastating attack. Now, reports indicate that even though the CIA and FBI had been warned about one of the bombing suspects, they still managed to elude America's security net.

More than a decade after 9/11 and hundreds of billions of dollars later, there are pressing questions about whether America’s investment in its “terrorism industrial complex” has made us safer. In Frontline's “Top Secret America,” Pulitzer Prize-winning reporter Dana Priest traces the journey from 9/11 to the Boston Marathon bombings, examines efforts to improve information sharing among federal agencies tasked with keeping us safe, and investigates the secret history of the twelve-year battle against terrorism.