Washington ? An unprecedented level of security will frame President Bush’s second inauguration, with officials planning to use thousands of police from across the country, new screening technology for inaugural guests and a military contingent that could include a combat brigade of up to 4,000 troops.

Security is always tight on Inauguration Day, but it will be magnified for the first inauguration since the Sept.11, 2001, terrorist attacks. Law enforcement officials have been preparing for months to protect U.S. and world leaders and citizens who attend.

Organizers are planning a traditional inauguration capped by a parade down Pennsylvania Avenue and the usual evening balls. Bush has yet to name his inauguration committee, which will oversee planning of the pageantry and festivities, but law enforcement agencies are in high gear.

As tens of thousands of people come to Washington to watch the Jan. 20 swearing in, the city will be filled with military personnel, FBI agents in full SWAT outfitting, snipers on rooftops and scores of bomb-detecting dogs.

About 2,000 out-of-town officers will help with security and traffic details.