FBI has warned of the potential for armed protests at the nation's Capitol and all 50 state capitol buildings beginning this weekend.
Some social media messages had targeted Sunday for demonstrations, though it remained unclear how many people might show up.Security in Washington, D.C., has intensified ahead of the inauguration.
Tall fencing surrounds the U.S. Capitol, the National Mall is closed to the general public, and the District of Columbia's mayor asked people not to visit.
Some 25,000 National Guard troops from around the country were due in the city by early in the week.In the states, some authorities said they had no specific indication that demonstrations would occur, much less turn violent.