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Gwen Ifill talks with George Wilson, military columnist for The National Journal and former Pentagon reporter for The Washington Post, about the bombing aftermath at the Pentagon and recovery efforts under way there.

How should the United States respond to the terrorist attacks? Former Secretary of State Warren Christopher, former national security adviser Samuel Berger and former Senator Warren Rudman (R-NH) discuss the government's options.

The Attorney General's Office and other federal agencies start multiple investigations into the terrorist attacks on the World Trade Center and the Pentagon.

After terrorist attacks in New York and Washington, D.C., the Federal Aviation Administration ordered all departing flights canceled nationwide for the first time in history. Flights will not resume until at least noon on Wednesday.