Some Senate aides barred the doors of their offices as protesters beat on them,shouting profanities. As it became clear the Senate chamber was not safe,security officers ordered the senators to leave.

As politicians and staff rushed out,aides grabbed hold of the boxes containing the Electoral College certificates,making sure that the vandals could not literally steal the results of the election.

"If our capable floor staff hadn't grabbed them,they would have been burned by the mob,"said Democrat Senator Jeff Merkley.

Through the tunnels of the Capitol,senators walked quickly with an armed police escort. A member of McConnell's security detail took the arm of the Senator,who walks with a limp because of a childhood bout with polio,pulling and steadying him as they hustled away from danger through a tunnel under the Capitol complex.

Before long,the President's supporters were inside the Senate chamber,prowling amid the mahogany desks and even sitting on the marble dais where Pence had been seated not long before.

Across the Capitol,a police officer stepped onto the House rostrum to inform lawmakers that they might need to duck under their chairs.

"We now have individuals that have breached the Capitol building,"he told them,warning House members to be prepared to move quickly out of the chamber."They are in the Rotunda."

"Call Trump,"Democrat Steve Cohen yelled to shouts and grumbles from the House floor."Call your friend."

Democrat Ruben Gallego,a veteran,jumped on the arm rests of chairs and began directing members,cautioning them to move calmly and quickly out of the chamber.

Capitol Police officers passed out gas masks to reporters in the press area above,as politicians pulled their own silver-boxed masks from underneath the chairs in front of them. There were warnings that tear gas had been fired in the Capitol Rotunda.

The chamber filled with frantic shouting and the whirring of the masks,their red lights flashing as lawmakers struggled to figure out how to unfold the plastic bags that were supposed to go over their heads. Police officers and floor staff yelled for everyone to exit,clambering over chairs and banisters to reach the doors.

A wooden chest was pushed in front of the main doors to the chamber,through which Pence and the chests of election certifications had come just an hour earlier. Security officers drew their guns and pointed and yelled at the door,whose glass panels were shattered,as politicians,staff and reporters cowered in the top levels of the chamber.

There was a bang,and evacuation momentarily stopped. Everyone was told to get down,with reporters and lawmakers struggling to hide behind low-backed chairs and equipment normally used to broadcast the floor proceedings.

Outside,members of the mob were making themselves at home throughout the Capitol,including inside House Speaker Nancy Pelosi's office.

Some of the protesters gawked at the grand and storied building they had unlawfully flooded while others looked at it with contempt.

"I don't trust any of these people,"said Eric Martin,49,a woodworker from Charleston,South Carolina,as he marvelled at the opulence of the Capitol and helped a friend wash pepper spray from his eyes."Absolute power corrupts absolutely."

But if some only stared at the Capitol,others resorted to violence.

A woman inside the building was shot by police and later died,the District of Columbia police said,and multiple officers were injured. A suspected explosive device was found around noon near the headquarters of the Republican National Committee,then rendered safe.

Later,DC police would confirm that four people died during the occupation;as well as the woman,three others died in medical emergencies.

Shortly after 2.45pm Washington time,the evacuation resumed,with a line of politicians and journalists clambering out of the House chamber. They were climbing over chairs,ducking under banisters – anything to get out quickly. Police officers had their guns drawn.

"Are you OK? Are you OK?"was the constant refrain as the members of Congress,aides and reporters scurried down staircases and hallways. Phones buzzed with texts and calls,with lawmakers frantically checking on staff that had been in office buildings and responding to family.

Senators gathered at a secure location in another building in the Capitol complex,with journalists asked to stay outside. FBI tactical units in camouflage with firearms and shields monitored the location,as senators spoke in hushed tones about whether and how to proceed with the electoral count.

"These thugs are not running us off,"said Democrat Senator Joe Manchin III."We're going to finish tonight. Everyone is committed to staying whatever it takes to get our job done."

As night fell,an announcement came over the loudspeaker in the Capitol telling lawmakers the city was now under a curfew. Distant sirens could still be heard blaring throughout the capital.

The New York Times