The area surrounding the US Capitol has been locked down after a report of "a security threat", which, according to the police, involved a vehicle ramming incident that injured two people.
An attack at the US Capitol complex in Washington DC has left one police officer dead and another in hospital with injuries.
Video shows the driver of the crashed auto emerging with a knife in his hand and starting to run at the pair of officers, Capitol Police Acting Chief Yogananda Pittman told reporters. They further added that the suspect did not appear to wrestle with the police officers.
"I'm heartbroken for the officer killed today defending our Capitol and for his family".
Pittman says the suspect rammed a barricade near the U.S. Capitol.
It comes as the Washington region remains on edge almost three months after a mob of armed insurrectionists stormed the Capitol as Congress was voting to certify Joe Biden's presidential win.More news: US Capitol on lockdown over security threat
Two law enforcement sources involved in the investigation told BBC partner CBS News that the suspect in the attack was 25-year-old Noah Greene from Indiana.
Police identified the slain officer as William "Billy" Evans, an 18-year veteran who was a member of the department's first responders unit.
The incident happened at a vehicle checkpoint on Constitution Avenue, on the Senate side of the U.S. Capitol Complex. USCP lifted an hours-long lockdown of the Capitol Friday afternoon after law enforcement determined the "external security threat" had been cleared.
"This time it does not appear to be an ongoing threat", Robert Contee, the acting chief of the Washington Metropolitan Police Department, told reporters Friday. At the time, the sources said that after the driver of the vehicle rammed his auto into a barricade on Constitution Avenue, the driver exited the vehicle brandishing a knife.
Authorities have begun only in the past couple of weeks to remove the outer ring of high, razor-wire-topped fencing erected around the Capitol complex after the January 6 insurrection by thousands of supporters of then-president Donald Trump.
The White House said the president has been briefed on the situation. "All three have been transported to the hospital", their statement said.More news: One officer killed after driver rams into US Capitol barricade
The officials initially said the suspect was being taken to the hospital in critical condition.
Speaking to MSNBC, and confirming some of the details of what took place, one Capitol Hill Police officer reportedly told the outlet: "We've been attacked".
Dozens of National Guard troops, who have been stationed at the Capitol since the January attack, quickly deployed after the incident.
The FBI's Washington, D.C., field office said it had "responded to an incident at the U.S. Capitol" and is providing support to Capitol Police.
-Security officials recently started scaling back fencing around U.S. Capitol.More news: Tucker Carlson says Rep. Matt Gaetz's appearance was 'weirdest interview' ever