How long will DC remain locked down, National Guard troops stay after Biden inauguration?
(Fox News National)

Neither Homeland Security nor the FBI, both agencies in charge of spearheading the special security event in Washington, D.C. on Inauguration Day, immediately made announcements Wednesday -- after Biden was sworn in outside the U.S. Capitol -- regarding how long a heightened militarized presence would remain in the downtown area now that the ceremony has ended.