.css-14iz86j-BoldText{font-weight:bold;}More than 60 people have been arrested and investigations are under way after the violent invasion of the US Congress in Washington DC on Wednesday.

Four people died when a mob loyal to President Donald Trump stormed the Capitol building, damaging property and forcing lawmakers to take refuge.

Top Democratic Senator Chuck Schumer has now called for Mr Trump to be removed from office immediately.

Those levelling criticism included President-elect Joe Biden, who said: “Nobody could tell me that if it was a group of Black Lives Matter protesters yesterday they wouldn’t have been treated very differently than the thugs that stormed the Capitol.”

The head of the US Capitol Police (USCP) said his officers had faced “criminal riotous behaviour” and he described officers’ actions as “heroic”.

“This president should not hold office one day longer,” said Mr Schumer, who will lead the new Democratic majority in the Senate when it begins its next session.

He threatened to start impeachment proceedings if Mr Trump’s cabinet did not remove him from office, using the 25th Amendment to the US Constitution, which allows the vice-president to step up if the president is unable to perform his duties owing to a mental or physical illness.

It would require Vice-President Mike Pence and at least eight cabinet members to break with Mr Trump and invoke the amendment – something they have so far seemed unlikely to do.

Nancy Pelosi, who leads the Democratic majority in the House of Representatives, has called Trump’s removal from office “an emergency of the highest magnitude”, and has left open the option of impeachment.

Congressman Adam Kinzinger from Illinois has become one of the first Republicans to call for use of the 25th Amendment, saying: “Fires stoked by the president finally leapt out of the pan.”

Democrats on the House Judiciary Committee have said that Mr Trump’s actions meet the amendment’s requirements.

Separately, both the House and the Senate have adjourned until after Mr Biden is sworn in on 20 January.

Ms Chao, who has served through the whole presidency and is married to the top Senate Republican, Mitch McConnell, said the events had “deeply troubled me in a way that I simply cannot set aside”.

Special envoy Mick Mulvaney, senior national security official Matt Pottinger, and Stephanie Grisham, press secretary to First Lady Melania Trump, have also stepped down. Several others are reported to be on the verge of quitting.

The president is also facing new restrictions on his use of social media. Facebook, which owns Instagram, has suspended him from both platforms at least until he leaves office and possibly indefinitely.

Images captured inside the Capitol building showed rioters strolling through some of the corridors unimpeded. One man occupied Ms Pelosi’s office, putting his feet up on her desk, while another was photographed walking out carrying a lectern.

Washington police say 68 people have so far been arrested, only one of them from the DC area.

One USCP officer has been placed on leave after a woman was shot dead on the floor of the House of Representatives. The woman, who has been named as air force veteran Ashli Babbitt, 35, was part of a group that forced its way into the chamber while it was still in session.

Mr Trump, while he told the mob in a Twitter video to “go home”, also continued to make false claims of electoral fraud and said he understood the “pain” of his supporters.

After the rioters left the Capitol, Congress reconvened to certify Mr Biden’s victory. Mr Pence resisted pressure from Mr Trump to throw out some of the votes and change the election result.

Shortly afterwards Mr Trump said in a statement that, although he disagreed with the outcome of the election, “there will be an orderly transition on January 20th”.

On Thursday the White House press office issued a statement saying it “grieves the loss of life” in Wednesday’s violence and would continue “to pray for a speedy recovery for those who suffered injury”.

Joe Biden calls the Capitol protest one of “darkest days” in US history, blaming President Trump for stoking violence.

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News – Capitol riot: Recriminations and arrests after Washington violence