Another police officer was injured; the suspect died at a hospital.

*Updated on April 2, 2021, at 4:44 p.m. (MT):

The U.S. Capitol building in Washington, D.C., was under lockdown, according to recent reports.

Two officers had been injured after a vehicle was rammed into one of the barricades. Both Capitol Police officers were taken to the hospital, with one having “succumbed to his injuries,” Capitol Police Acting Chief Yogananda Pittman told reporters. The identity of the fallen officer has been announced as Officer William "Billy" Evans, who was an 18-year member of the Capitol Police.

“It is with profound sadness that I share the news of the passing of Officer William 'Billy' Evans this afternoon from injuries he sustained following an attack at the North Barricade by a lone assailant," Acting U.S. Capitol Police Chief Yogananda Pittman said. "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. Please keep Officer Evans and his family in your thoughts and prayers."

The suspect was shot by officers and died at a hospital. No motive is known at this time.

Per the AP, "Fencing that prevented vehicular traffic near that area was recently removed as the Capitol has started to open up after the Jan. 6 riots."

🚨🚨A helicopter just landed on the east front of the Capitol. I’ve never seen anything like this before. ever. pic.twitter.com/LxV0mywRSe

— Jake Sherman (@JakeSherman) April 2, 2021

Just in: US Capitol Police says two officers are injured after someone rammed a vehicle through the perimeter fence around the Capitol — as DC Fire and EMS now confirm that at least one person has been shot.

— Hugo Lowell (@hugolowell) April 2, 2021

A message was sent out to congressional staff, as officials warned of "an external security threat," according to CBS News and NBC News.

Here is the threat alert U.S. Capitol Police blasted out to staff: pic.twitter.com/zowyVXteiA

— Kathryn Watson (@kathrynw5) 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

*This is an on-going story and will be updated as more information is made known. Refresh for updates!!