Chaos has broken out within the US Capitol as supporters of President Donald Trump break into the building.
The ongoing special House and Senate sessions have been halted amid the escalating clashes between protesters and police.
Lawmakers had gathered to confirm the election of Democratic President-elect Joe Biden - an outcome rejected by protesters.
Photos show demonstrators gathered just outside the Senate chamber, while other images show demonstrators carrying firearms.
Mr. Trump has broken his silence and tweeted for demonstrators to "support Capitol Police and Law Enforcement".
US media report that tear gas has now been used inside the Capitol building as a growing number of demonstrators enter the building.
DC Mayor Muriel Bowser has ordered a citywide curfew beginning at 6pm.
Damage the Republic
Meanwhile, as Republicans in Congress earlier pushed forward with an attempt to block the certification of election results, Republican Senate leader Mitch McConnell condemned his colleagues and warned they could "damage the Republic forever".
Speaking directly to his party members on the Senate floor, McConnell urged them to reconsider their actions.
He said if this election were overturned by mere allegations from the losing side, democracy would enter a death spiral.
The challenge to the election results is not likely to succeed, but it will prolong matters in the chamber.
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