9/11 panel report: 'We must act'

'We do not have the luxury of time,' says commission chairman

	VIDEO What went wrong, according to the 9/11 report. PLAY VIDEO What now? The 9/11 commissioners' recommendations. PLAY VIDEO Thomas Kean, 9/11 commission chairman, summarizes report: U.S. didn't grasp terror threat. PLAY VIDEO Report details the final moments aboard the doomed flights. PLAY VIDEO RELATED Chapter by chapter:  The 9/11 commission report • Gallery: Reaction • Gallery: Key testimony • Gallery: Commission members • The final moments of Flight 93 • The 9/11 commission KEY FINDINGS U.S. leaders did not understand the "gravity of the threat." The United States wasn't prepared to meet al Qaeda's challenges. Terrorism wasn't the chief security concern of the Bush or Clinton administrations. Failures to thwart 9/11 highlight agencies' inability to adapt to new problems. CIA effectiveness was limited by use of intermediaries to pursue Osama bin Laden. Information and analysis wasn't shared across agencies.