A mob of Donald Trump's supporters stormed the US Capitol on January 6 in a bid to overthrow November's presidential election result.
Dozens of protesters broke into the building and roamed the corridors as tens of thousands gathered outside in support of the president’s false claims of election fraud.
Five people died, including one law enforcement officer, and over 200 people have been charged by federal prosecutors so far. Investigations into 400 others are ongoing.
"The scope and scale of this investigation in these cases are really unprecedented, not only in FBI history but probably Department of Justice history," said acting US Attorney Michael Sherwin in January.
Here's everything else we know:
Donald Trump Impeached
The House of Representatives voted to impeach Donald Trump following the riot, making him the first president in US history to be impeached twice.
Democrats argue Mr Trump's address to a rally of a supporters incited the attack on the Capitol. The formal trial begins on January 9 - senators have already been sworn in for the proceedings.
Democrats maintain Mr Trump's refusal to concede the November election played a part in encouraging the assault.
According to lawmakers, the former president incited the riot - telling his supporters to march on Congress and “fight like hell” in his attempt to overturn his election defeat to President Joe Biden.
"His incitement of insurrection against the United States government, which disrupted the peaceful transfer of power, is the most grievous constitutional crime ever committed by a president," they said yesterday.
What happened at the US Capitol?
Following the Trump speech, a large group of his supporters marched up Capitol Hill from the White House and descended on the Capitol Building cashing with officers. As reports of armed stand-offs emerged, Congressmen were evacuated from the chamber.
The first protesters reached the inside of the building around 2pm, shortly after both the Senate and the House began proceedings to certify the election results.
In the House chamber, security officers pulled their guns to barricade the door. At least one pro-Trump protester made it into the Senate chamber, sitting with hand aloft in victory.
Photographs soon emerged of protesters on the floor of the House. One showed a man in a bobble hat sitting in Vice-President Mike Pence’s chair, arm aloft in victory.
As rioters shouted and waved Trump and American flags, people inside the building were directed to duck under their seats for cover and to put on gas masks as tear gas was deployed in the Capitol Rotunda.
Why were Trump supporters protesting?
Thousands of the president’s faithful had gathered the night before, arriving after Mr Trump demanded support for his ongoing claim that he, not Mr Biden, was the real election victor.
It was the day when Congress was to perform its largely ceremonial duty of signing off the results ahead of the inauguration on January 20, when Mr Biden became president.
Who died at the US Capitol?
A total of five people died during the incident, including a law enforcement officer and veteran.
US Air Force veteran Ashli Babbit was married and lived near San Diego, California.
She was fatally shot in the chaos, her husband told US news channel KUSI. Mrs Babbit appeared to have been shot in the neck, before a mob tried to attend to her. It was unclear who fired the shot.
Ms Babbit, a Trump supporter, served for 14 years in the service and had been involved in four tours of duty, the channel reported.
![Ashli Babbit was shot in the Capitol riots](/https/www.telegraph.co.uk/content/dam/news/2021/01/07/TELEMMGLPICT000248145136_1_trans_NvBQzQNjv4BqqwwNAECrD5S6hf9oI2CkBzWGR5PEnfFJztrZAXxo6bs.jpeg?imwidth=350)
Capitol police officer Brian Sicknick died of injuries suffered during the riot, the force said.
"Officer Sicknick was responding to the riots ... and was injured while physically engaging with protesters," police said.
He succumbed after being taken to hospital following his collapse upon returning to his divisional office.
What has Donald Trump said?
Mr Trump had addressed the crowds hours before they marched on the Capitol, telling them to “stop the steal” and doubling down on his false claims of election victory.
As the violence broke out, Mr Trump later called for calm, tweeting: “I am asking for everyone at the US Capitol to remain peaceful. No violence!”
Mr Trump later released a video calling his supporters to go home. He said: “You have to go home now. We have to have peace. We have to have law and order. We have to respect our great people in law and order. We don’t want anybody hurt.”
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But moments later, the president doubled down on his baseless claims of election fraud. Even as the Capitol was being assaulted, Mr Trump continued to tweet false claims that the election had been stolen.
On the evening of January 7, Mr Trump acknowledged that a new US administration would take over on January 20 and condemned the mob that stormed the Capitol during a conciliatory new video address.
In a message of unity delivered to the camera, the US president said his supporters who broke into the Capitol had “defiled the seat of American democracy”.
Mr Trump called for punishments for those who had broken the law and urged calm, saying that “tempers must be cooled and calm restored”.
He also promised to work towards the “smooth, orderly and seamless transfer of power” in what was his firmest drawing of a line under the election results to date.
![Richard 'Bigo' Barnett got into the office of Nancy Pelosi, the Speaker of the House](/https/www.telegraph.co.uk/content/dam/news/2021/01/06/TELEMMGLPICT000248113664_1_trans_NvBQzQNjv4BqpVlberWd9EgFPZtcLiMQfyf2A9a6I9YchsjMeADBa08.jpeg?imwidth=350)
What has Joe Biden said?
Mr Biden condemned the violence and called on protesters to fall back in a statement delivered to the cameras (see video below).
"Let me be very clear. The scenes of chaos at the Capitol do not reflect the true America [and] do not represent who we are," the president-elect said.
“What we’re seeing are a small number of extremists dedicated to lawlessness. This is not dissent, it’s disorder. It’s chaos. It borders on sedition. And it must end now.
“I call on this mob to pull back and allow the work of democracy to go forward.”
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Mike Pence issued a more forceful call for rioters to depart. "This attack on our Capitol will not be tolerated and those involved will be prosecuted to the fullest extent of the law," he wrote on Twitter.
Mike Pompeo, the US secretary of state, said that "violence is intolerable" and that the actions of the rioters were unacceptable.
How have social media platforms responded?
Mr Trump was permanently banned from Twitter and Facebook after growing calls for social media platforms to remove the president's incendiary posts, or delete his accounts entirely.
Twitter said Mr Trump's refusal to attend Mr Biden's inauguration was being received by his supporters as "further confirmation that the election was not legitimate" and him disavowing his previous claim there would be an "orderly transition".
Following the ban, Twitter deleted two tweets apparently issued by Mr Trump on the @POTUS account, and also suspended the @TeamTrump account after it spread a statement from the president.
Twitter claimed one of his tweets may also "serve as encouragement to those potentially considering violent acts that the inauguration would be a 'safe' target, as he will not be attending".
![Twitter permanently suspends @realDonaldTrump account.](/https/www.telegraph.co.uk/content/dam/news/2021/01/09/TELEMMGLPICT000248268811_2_trans_NvBQzQNjv4BqM37qcIWR9CtrqmiMdQVx7EYpOvaOk7B-h8Gr4_aZAyo.jpeg?imwidth=350)
The use of the words "American Patriots" to describe some of his supporters was also being interpreted as support for those committing violent acts at the US Capitol, Twitter said.
It added: "Plans for future armed protests have already begun proliferating on and off Twitter, including a proposed secondary attack on the US Capitol and state capitol buildings on January 17, 2021.
"As such, our determination is that the two tweets... are likely to inspire others to replicate the violent acts that took place on January 6, 2021, and that there are multiple indicators that they are being received and understood as encouragement to do so."
Facebook removed a short video on January 6 that Mr Trump had posted to his social media accounts.
Facebook's vice president of integrity, Guy Rosen, said the action was taken "because on balance we believe it contributes to - rather than diminishes - the risk of ongoing violence".
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How the world reacted
Boris Johnson called on the US to restore the rule of law following "disgraceful scenes in US Congress".
"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," the British prime minister tweeted.
EU officials expressed shock at the "assault on US democracy".
"To witness tonight's scenes in Washington DC is a shock," European Council president Charles Michel tweeted.
"In the eyes of the world, American democracy tonight appears under siege," the European Union's foreign policy supremo Josep Borrell said, in a separate tweet.
"This is an unseen assault on US democracy, its institutions and the rule of law. This is not America. The election results of November 3 must be fully respected," Mr Borrell said, referring to the US presidential election that saw Mr Trump beaten by Joe Biden. "The strength of US democracy will prevail over extremist individual."
Speaking to Sky News, Kim Darroch, the UK's former ambassador to the US, shared his belief that Mr Trump was not fit to be president, before suggesting No 10 "got too close" to the Trump presidency.
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The German Chancellor, Angela Merkel, announced she was "furious and saddened" by the violence seen in Washington DC, and said Mr Trump shared the blame for the unrest among his supporters.
"I deeply regret that President Trump has not conceded his defeat, since November and again yesterday," she said at the time, before adding: "Doubts about the election outcome were stoked and created the atmosphere that made the events of last night possible."
Chinese officials gloated over the chaos seen in DC. State-owned outlets mocked US politicians who had spoken out in support of pro-democracy protesters in Hong Kong who had stormed the city's legislative building in 2018.
The Communist Party mouthpiece, the Global Times, in their pinned tweet, said: