Washington ? President Bush will be sworn in next month for a second term amid the tightest security in inaugural history, with police planning to search every one of the tens of thousands of people expected to line the parade route.

Behind the scenes, thousands of specialized law enforcement and military personnel will stand ready to respond to any emergency.

Security planners say they have seen no intelligence indicating terrorists will attempt to target the first inauguration since the 9-11 attacks. But authorities are preparing for the worst, even as they strive for as open and accessible an event as possible.

“We are aware we are at war,” said Terrance Gainer, police chief at the Capitol, where the Jan. 20 ceremony will take place. “The whole world will truly be watching.”

The extra security measures include bomb-sniffing dogs, sophisticated sensors to detect chemical, radiological or biological material, and expanded use of police helicopters and military aircraft. Thousands of police officers from the Washington suburbs and other cities will be in place.