Supporters of US President Donald Trump have stormed the Capitol, forcing Congress to halt a joint session to confirm President-elect Joe Biden's victory in the November election.
The joint session of Congress was convened on Wednesday to count the votes of 538 electors who have been chosen from each state.
The proceedings are usually completed quickly. But some Republicans challenged Biden's win in the western state of Arizona.
Protesters stormed past police and barricades to enter the Capitol. They occupied the balcony and waved flags.
Deliberations by Congress members were suspended to secure safety.
Washington Mayor Muriel Bowers ordered a citywide curfew starting at 6 p.m.
Prior to these developments, Trump appeared in front of protesters, where he reiterated his claims that the election was rigged.
He said: "We will never give up. We will never concede," and called on the protesters to head to the Capitol.
But Biden's victory is expected to be finalized as it is highly unlikely that Congress members will approve the objections.