A US Capitol police officer died Friday during an altercation after a driver rammed into the north barricade of the U.S. Capitol, law enforcement officials confirmed.

Officer William ‘Billy’ died Friday from injuries he sustained during the attack, The U.S Capitol Police said in a statement.

“Officer Evans had been a member of the United States Capitol Police for 18 years. He began his USCP service on March 7, 2003, and was a member of the Capitol Division’s First Responder’s Unit,” the statement read. “Please keep Officer Evans and his family in your thoughts and prayers.”

The suspect was killed, police confirmed at a press conference.

According to ABC News, the suspect was later identified as 25-year-old Noah Green.

After reportedly leaving the vehicle and brandishing a knife, he began to run toward Capitol police and he was shot.

“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 said. “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.”

House Speaker Nancy Pelosi ordered that flags at the Capitol be at half-staff due to the police officer’s death, her Deputy Chief of Staff, Drew Hammill, wrote on Twitter.

Speaker Pelosi has ordered the flags at the U.S. Capitol to be flown at half-staff due to the death of a U.S. Capitol Police Officer in the of duty today. The process of lowering the flags may take longer than usual because of the Capitol’s current lockdown status.

— Drew Hammill (@Drew_Hammill) April 2, 2021

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The United States Capitol is on lockdown due to an “external security threat.”

BREAKING: Capitol Hill is on lockdown due to “external security threat”. Those inside can move around but are told to stay away from window. Watch BNC’s coverage live https://t.co/mpKQ1GrIAn pic.twitter.com/ibwQIQhd0q

— BNC (@BNCNews) April 2, 2021

The United States Capitol Police responded to the North Barricade vehicle access point along Consitution Avenue for reports that someone “rammed a vehicle” into two officers.

Both officers were injured and a suspect is in custody.

CRITICAL INCIDENT: USCP is responding to the North Barricade vehicle access point along Independence Avenue for reports someone rammed a vehicle into two USCP officers. A suspect is in custody. Both officers are injured. All three have been transported to the hospital. pic.twitter.com/4TXIdulJc6

— U.S. Capitol Police (@CapitolPolice) April 2, 2021

UPDATE | Capitol Police say a driver tried to ram a car into the complex and struck two Capitol Police officers at the North Barricade shortly after 1 p.m. The suspect is in custody and all three were injured and have been taken to a hospital. pic.twitter.com/BNPfTkbsCh

— BNC (@BNCNews) April 2, 2021

Police closed parts of Constitution Avenue in response to the threat.

Due to the external security threat at the North Barricade of the U.S. Capitol, the following road closures are in effect:

-Constitution Avenue between Second Street NE and First Street NW.

-First Street between Constitution Avenue NE and Independence Avenue SE.

— U.S. Capitol Police (@CapitolPolice) April 2, 2021

This threat comes months after rioters stormed the Capitol in a deadly insurrection.

RELATED: Race double standard clear in rioters’ Capitol insurrection

Reaction to the incident quickly began pouring in on social media.

Praying for the safety of Capitol Police and all at the U.S. Capitol.

— Rep. Val Demings (@RepValDemings) April 2, 2021

I am on lockdown inside the Capitol complex. Lots of first responders called and a helicopter just landed on the East front pic.twitter.com/7hKjPeX3Ah

— Leigh Ann Caldwell (@LACaldwellDC) April 2, 2021

I’m safe and locked down here at the Capitol. Thankful today & every day for the US Capitol Police.

— Rep. Ro Khanna (@RepRoKhanna) April 2, 2021

Please keep the Capitol Police and first responders in your prayers as we try to understand the situation unfolding at the Capitol right now.

— Rep. Peter Meijer (@RepMeijer) April 2, 2021

This is a developing story. Check back for updates.