There is no credible threat against the nation's capital, but Washington is on high alert after a bomb blast in Manhattan hurt 29 people and two other bombs exploded in New Jersey.
D.C. Mayor Muriel Bowser said officials are closely monitoring any potential security threats.
"We have no specific reason to be concerned, but we're the nation's capital, so we remain at a highly vigilant level," she said at a news conference.
"We are continuing to monitor what happens in New York," Bowser said. "We are paying very close attention to it and working with our federal partners."
Bowser said there are no plans to alter events this weekend, as thousands of people are expected on the National Mall for the opening of the National Museum of African American History and Culture.
Increased security was apparent at Union Station on Monday, with additional bomb-sniffing dogs and uniformed security officers. Amtrak told riders on Monday morning to expect cancellations and delays, though there were no "specific or credible threats," Amtrak said.
"Enhanced security measures are in place at stations, on trains and along the tracks," the rail service said in a statement.