Trump supporters have broken through several security fences at the Capitol building and battled with police.
The MAGA die-hards stormed the Washington D.C. building ahead of a ceremonial vote that will eventually declare Joe Biden won the electoral college vote.
Washington Post reporter Rebecca Tan wrote on Twitter: "Protesters are charging toward the Captiol [sic] steps. Some tried to scale the construction structures and have been tackled by police.
"They want to enter the building and are making attempts at intervals. Capitol police trying to hold them back."
Politician Terri A. Sewell added: "There has been a breach of the Capitol building. We are locked inside the House chamber until Capitol Police allows us to leave. Praying that this chaos dissipates and no one gets hurt"
The demonstration has plunged the Capitol into lockdown, according to the ABC.
People inside the building have been told to 'stay away from exterior windows, doors. If outside, seek cover'.
Multiple news organisations have reported a woman has been shot in the chest and is in critical condition.
Protestors have also since been able to gain access to the Senate floor.
Huffington Post reporter Igor Bobic says the protestors are going 'door to door' and are shouting: "Where the f*** are they?"
CBS reporter Zak Hudak has tweeted an image of Capitol Police using a cabinet to barricade themselves inside. Other photos show they have now drawn their weapons.
Washington D.C.'s Mayor Muriel E Bowser has imposed a citywide curfew to curb the erratic and violent behaviour.
A joint session of Congress is due to take place that will methodically count each Electoral College vote and is largely ceremonial. Trump has urged his Vice President, Mike Pence, to refuse to certify the vote, however the VP has rejected that call.
The violence comes after a threat was made to fly a plane into the Capitol building. The digitised voice recording broadcast on air traffic control frequencies on Monday afternoon said: "We are flying a plane into the Capitol on Wednesday. Soleimani will be avenged.'
The Iranian military commander was killed by an airstrike at Baghdad airport on 3 January 2020, with Donald Trump subsequently calling him a 'monster' and claiming a 'lot of lives had been saved by killing him'.
Since then, there have been numerous threats to avenge Soleimani's death, with the latest threat issued on the anniversary of his death.
While the US government does not believe the warning of an attack on the Capitol Building is credible, it is being investigated as a breach of aviation frequencies, according to CBS News.
Sources told the network that the Pentagon and other agencies had been briefed and a message was sent to air traffic controllers on Tuesday, reminding them that any threats or planes deviating from their flight paths should be reported immediately.
The FBI declined to comment on the investigation but said it takes 'all threats of violence to public safety seriously'.
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