The United States Capitol was locked down on Friday after a knife-wielding suspect identified as Noah Green rammed his car into two police officers at the North Barricade and then emerged wielding a knife.

The 25-year-old suspect from Indiana killed one Capitol police officer and injuring another before police fired upon him, according to Fox News.

A law enforcement source said Noah Green identified himself as a follower of the Nation of Islam and its founder, Louis Farrakhan, who has recently lost his job.

In his post on social media weeks before the attack, Noah Green said these past few months have been tougher, and he had been tried with some of the biggest unimaginable tests in his life.

"I am currently now unemployed after I left my job partly due to afflictions, but ultimately, in search of a spiritual journey," the suspect said as reported by Associated Press.

Noah Green also posted on social media, which has since been taken down, that he believed that federal law enforcement agencies targeted him for their "mind-control" experiments.

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The Capitol Attack Incident

According to acting chief of the U.S. Capitol Police Yogananda Pittman, Noah Green ran at the pair of officers wielding a knife. 

Pittman said police officers shot the suspect when he started lunging toward the cops. Noah Green later died at a hospital.

Pittman said that this had been a tough time for the U.S. Capitol Police after the Jan. 6 events and now the attack that killed its officer William "Billy" Evans. 

Evans was an 18-year veteran and was a member of the department's first responders unit. Police said the injured officer is already in a "stable and non-threatening condition."

Two law enforcement officials said that investigators first believed that the suspect stabbed one of the officers. Later, it was unknown whether the knife made contact.

Officers were not allowed to discuss the investigation publicly. They spoke on the condition of not revealing their names.

President Joe Biden and First Lady Jill Biden are heartbroken over the attack on the Capitol. Biden said he had ordered that White House flags be lowered to half-staff in honor of Evans.

"I want to express the nation's gratitude to the Capitol Police, the National Guard Immediate Response Force, and others who quickly responded to this attack," Biden said as reported by New York Post report.

The President also sends his heartfelt condolences to Evans' family and everyone grieving his loss.

Two months ago, the Capitol grounds also faced a security breach when protesters entered the premises and crowded halls inside the Capitol building.

Five people were reported to have died in an attempted insurrection against the United States. It includes a Capitol police officer who died from his injuries, according to The Guardian report. Biden commented on the earlier attack saying that it was a riotous mob and the participants were domestic terrorists.

One avid Trump supporter had also died during the event. She was identified as Rosanne Boyland, a resident of Kennesaw, Georgia.

Boyland was known to have a criminal history, including battery, obstruction of law enforcement, and trespassing.

READ MORE: 7 More People Federally Charged in Connection to Capitol Riot 

WATCH: Capitol Police Confirm Knifeman Killed One of Their Officers, veteran cop Billy Evans - From Daily Mail