The Investigation

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The rubble is still smoldering. The manhunt is on. 4,000 FBI agents, an unprecedented number, are searching for the perpetrators of Tuesday’s act of mass murder. Lower Manhattan, the pentagon and a field in western Pennsylvania have become the world’s biggest crime scene.

But it’s hard to tell what the rubble can reveal. Ironically, the best clues to what happened in the air may be found in the farewell cell phone calls of those on board the hi-jacked planes. On the ground, investigators are working backward along the trail of the hijackers: From flying schools in Florida to Boarder crossings in Maine to car rental offices in Boston.

What we know now/where we look next.

Guests:

John D. Moore, former terrorism analyst at the State Department and political analyst with the Defense Intelligence Agency

and Ralph Ranalli, Boston Globe reporter.