A police officer has been killed and another injured after a man rammed his car into a barricade outside the US Capitol building on Friday.

In a statement shared to Twitter, the US Capitol Police (USCP) said the suspect in a blue sedan rammed his vehicle into the North Barricade, hitting two USCP officers.

The driver then got out of his car with a knife and started running at the officers, stabbing one of them.

At least one officer drew their weapon and fatally shot the suspect.

Both officers were hospitalised, and one of them succumbed to their injuries.

The slain officer has been identified as William “Billy” Evans, who had served with the US Capitol Police for 18 years and was a member of the Capitol Division’s First Responder’s Unit.

“We are devastated to share the sad news that one of our officers involved in this afternoon’s incident passed away,” the USCP tweeted.

This comes three months after a mob of Pro-Trump supporters stormed the US Capitol in protest of President Joe Biden‘s election, resulting in the death of five people.

“I just ask that the public continue to keep U.S. Capitol Police and their families in your prayers,” Capitol Police Acting Chief Yogananda Pittman told The Associated Press on Friday.

“This has been an extremely difficult time for U.S. Capitol Police after the events of Jan. 6 and now the events that have occurred here today.”

The incident took place just after 1pm on Friday, plunging the Capitol Campus into lockdown immediately.

Authorities said there was no ongoing threat and that the attack did not appear to be terrorism-related.

They added that there was no immediate connection between the crash and the January 6 riot.

Image: Getty Images / Bill Clark