The FBI also has launched a system to share tips about possible terror threats with local police agencies.
For the first time, the president declared an emergency in the District of Columbia in advance of the inauguration that will cover 100 percent of eligible local inauguration costs for emergency protective measures on Tuesday. This is in addition to the $15 million Congress set aside for Washington inauguration security costs.
The large crowds predicted for the events raise logistical, security and public safety concerns.
"It only takes a minor event to create a stampede of people," said Wendell Shingler, former director of the Federal Protective Service, which provides security around government buildings. Shingler, who participated in the 2005 inauguration security plans and operations.
Shingler said horses calm crowds and help break up angry mobs. Law enforcement officials expect to have several mounted officers around the parade route.