(CNSNews.com) -  The director of the U.S. Secret Service, Mark Sullivan, said no security threats have been made to any upcoming presidential inauguration events, but increased security measures are being taken because of the inauguration's “historic nature” and the vast number of people expected to attend.

Sullivan’s comments were made during a press conference in Washington, D.C., on Tuesday with Virginia Gov. Tim Kaine (D), Maryland Gov. Martin O’Malley (D) and D.C. Mayor Adrian Fenty (D) about safety and security during the presidential inauguration of Barack Obama.

Sullivan said Homeland Security Secretary Michael Chertoff and the Department of Homeland Security have no evidence to suggest there is any threat to the inaugural events.

"As Secretary Chertoff has stated, we have no credible intelligence to suggest that there is a threat to any of the inaugural events," said Sullivan. "Nevertheless, given its historic nature, its importance to our democratic process and the large number of people expected to attend, collectively we have endeavored to make this inauguration as safe and secure as possible."




Mayor Fenty said the inauguration has cost Virginia, Maryland, and Washington, D.C. approximately $75 million dollars combined.

"I think the total for all three is about $75 [million] and obviously there is a lot being spent by the federal government -- $75 million dollars," Fenty said.

The Joint Congressional Committee on Inaugural Ceremonies told CNSNews.com they had appropriated $1.24 million for the inauguration events.

District and federal officials are reportedly preparing for as many as 3 million people to fill the city for events surrounding the inauguration. Fenty told CNSNews.com that security is going to be tight to avoid "gridlock."

"Well, some of the security measures being taken are related to being better prepared, and I'll defer those to the secret service,” said Fenty.  “A lot of the road closures and preparations being made are actually traffic, transportation, and quality-of-life related as well," he said. "We are trying to avoid gridlock and sometimes, ironically, to avoid gridlock, you actually end up closing a street to allow traffic to flow better."

According to the official presidential inauguration Web site of the City of Washington, and repeated at Tuesday's press conference, the inbound Key Bridge, the 14th Street, Memorial, and Roosevelt bridges will be closed through Monday and into Tuesday, the day of the inauguration. Also, approximately 3.5 square miles of downtown Washington around the National Mall, including the business district and government buildings, will be blocked to traffic starting the afternoon of Jan. 19 until the morning of Jan. 21, the day after Obama's inauguration.