A suspect has been shot dead and a police officer has been killed after a car rammed into a barricade near the US Capitol building.
The acting chief of the Capitol Police Yogananda Pittman said the suspect jumped out of the vehicle brandishing a knife after he drove at the officers at around 1pm local time (6pm UK time).
She continued: “The suspect did start lunging towards US Capitol police officers, at which time US Capitol police officers fired upon the suspect.
“At this time the suspect has been pronounced deceased.
“Two US capitol police officers were transported to two different hospitals and it is with a very heavy heart that I announce one of our officers has succumbed to his injuries.”
Officials have said the suspect, who has not been identified, died in hospital.
Ms Pittman said the suspect did not appear to have been on police radar.
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Authorities added there was no longer an ongoing threat and that the attack did not appear to be related to terrorism.
There is also no immediate connection apparent between Friday’s crash and Capitol riot on 6 January.
The crash and shooting happened at a security checkpoint near the Capitol as Congress is on recess.
Sky correspondent Alex Rossi, who is in Washington DC, said: “Police are carrying out forensic investigations, so they’re gathering evidence, trying to understand exactly what has happened and why this has happened as well as how it was able to happen.
“Also, the FBI has now responded to this incident… they will be carrying out their own inquiries, trying to understand how and why this happened.”
Staff inside the building in Washington DC were sent a message telling them no entry or exit was allowed and they were warned to stay away from exterior windows and doors.
The message added: “If you are outside, seek cover.”
The attacks comes as the Washington region remains on edge nearly three months after a mob of armed insurrectionists stormed the Capitol as Congress was voting to certify Joe Biden’s presidential win.
Five people died in the riot, including Capitol Police officer Brian Sicknick, who was among a badly outnumbered force trying to fight off insurrectionists who supported former President Donald Trump’s bid to overturn the election.