Police in Washington, D.C. have begun closing off streets,as part of the security steps being taken for President Bush's inauguration Thursday.
Coast Guard boats patrol the Potomac River. Surveillance airplanes safeguard the skies. And sophisticated sensors stand ready to detect a chemical or biological attack.
There also are snipers perched on rooftops, and miles of metal barricades.
This is the first inauguration since the 9/11 terror attacks, and the director of the Secret Service calls the level of security "unprecedented."
See live coverage of the inauguration from 7 a.m. to 1 p.m. Thursday, followed by a special edition of 11 News, at 1 p.m.
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