Donald Trump has called on his own supporters to remain peaceful after they stormed the U.S. Capitol.
"Please support our Capitol Police and Law Enforcement," Trump tweeted. "They are truly on the side of our Country. Stay peaceful!"
Police snipers are moving onto the roof of the building, according to CNN.
This came after rioters smashed windows and interrupted a joint session of Congress.
They even occupied the office of House Speaker Nancy Pelosi.
It came as legislators were in the midst of certifying the Electoral College victory of President-elect Joe Biden.
Some of the rioters believe that Trump was cheated out of an election victory even though his campaign has lost 60 court cases trying to advance this claim.
Former U.S. attorney general William Barr described the violence as "outrageous and despicable".
Police have been slow to respond, according to news reports.
Meanwhile, the mayor of Washington, Muriel Bowser, has ordered a curfew, which takes effect at 3 p.m. Pacific standard time.
A woman who was shot after rioters entered the U.S. Capitol has died, according to the New York Times. The woman was a civilian and her name has not been released.