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Horrifying video captured the sound of a gunshot ringing out inside the Capitol in Washington as pro-Trump protesters stormed the building.
As armed police confronted the protesters, the gunshot echoed round a packed corridor inside the building.
Bystanders could be heard shouting that someone has been shot as people rush to tend to a person on the floor.
Voices can be heard saying "we've got an active shooter here, get her down" as heavily armed police and security personnel stand guard over what appears to be a stricken woman, pushing the crowds back.
It was later reported that a woman had died after being shot inside the Capitol.
A woman was shot inside the US Capitol Building
Fury at US Capitol policeman caught posing for selfie with Trump-supporting rioter
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The chaos erupted after President Donald Trump addressed thousands of supporters at a rally near the White House before chaos ensued, promising to "never concede" that he had lost before Congress met on Wednesday to certify Democrat Joe Biden's presidential win.
After Mr Trump seemingly egged them on to march to Capitol Hill, supporters breached barricades and fought past police to storm into the building, forcing Congress to halt the voter certification process.
The footage showed chaotic scenes as the gunfire erupted
Trump earlier ordered supporters to 'go home' but told them he loved them
(Image: Getty Images)
As rioters shouted and waved Trump and American flags while marching through the halls, people inside the building were directed to duck under their seats for cover and put on gas masks after tear gas was used in the Capitol Rotunda.
One person was reportedly shot during skirmishes between police and Trump supporters.
One protester was photographed in the Senate president's chair, as crowds chanted "we want Trump".
Donald Trump released a video on social media
Capitol police officers point their guns at a door that was vandalized in the House Chamber
(Image: Getty Images)
As pressure mounted on President Trump to condemn supporters as they clashed with law enforcement, he tweeted: " "I am asking for everyone at the US Capitol to remain peaceful. No violence! Remember, WE are the Party of Law & Order – respect the Law and our great men and women in Blue. Thank you!"
The Department of Homeland Security said additional federal agents were sent to the US Capitol to help quell violence, with officers from the Federal Protective Service and US Secret Service to assist US Capitol Police.
The White House said National Guard troops are also heading to the Capitol to help resolve the situation.
Trump supporters storm the Capitol in scenes liked to an 'insurrection'
Law enforcement officials said at least one explosive device was found near the US Capitol, confirming it was "no longer a threat".
Addressing the nation, Mr Biden said that democracy is "under an unprecedented assault" and demanded that President Trump make a televised address calling on his supporters to cease the violence.
The riots have been condemned by numerous US and UK politicians, including British Prime Minister Boris Johnson who described the "disgraceful scenes", adding: "The United States stands for democracy around the world and it is now vital that there should be a peaceful and orderly transfer of power."
A supporter of US President Donald Trump sits in Pelosi's office
(Image: AFP via Getty Images)
In a video posted on Twitter, President Trump asked his supporters to "go home", claiming the results of the election were fraudulent and he feels their "pain".
At about 10.45pm, an official finally said that the The U.S. Capitol building has been secured,hours after rioters stormed the seat of government and entered the lawmakers' chambers.