A auto crashed into a security barrier before the driver lunged towards the officers with a knife, police said.
The lockdown at the U.S. Capitol was lifted about two hours after a person rammed a vehicle into barriers surrounding the complex on Friday afternoon, leaving one police officer dead and another injured.
According to the acting chief of US Capitol Police, the suspect shot by officers in an altercation outside the Capitol building on Friday exited his vehicle and charged the officers with a knife in his hand.
Biden, who is spending the weekend at Camp David, also ordered the USA flag to be flown at half-staff at the White House and all federal buildings Friday until sunset on April 6 in honor of Evans.
Earlier, a message played over the loudspeakers inside the Capitol said that all buildings were being locked down "due to an external security threat" and staff members were told they could not enter or exit the buildings. A senior law enforcement official confirmed to The Daily Beast that Green was the suspect, though he has not yet been officially identified by police.
No information was immediately available on the identity of the attacker or his motivation.
In one post Green praised Louis Farrakhan as "Jesus". The network also said that Green identified himself as a member of the Nation of Islam in a Facebook post.
Top officials expressed shock over the attack and sympathy for Evans, an 18-year veteran of the force. "Please keep Billy Evans and his family in your prayers".
US Capitol on lockdown after police officers rammed by car
Over the last few weeks political pressure has grown for Pelosi to remove protective fencing erected in the aftermath of the attack.
"We are deeply saddened by his loss and our deepest condolences to him and his colleagues at the United States Capitol Police Department", said Ryan. The US Attorney General is also aware of the incident and is being updated, according to CBS News.
National Guard troops were mobilized Friday and staff at the huge Capitol complex ordered to stay away from windows and seek cover after alerts went out over the incident shortly after 1pm (1700 GMT).
The Capitol buildings have been placed under lockdown, with nobody allowed in or out of the complex. Capitol Police officer, Brian D. Sicknick, died a day after rioters supporting former President Donald Trump stormed Capitol on January 6 "due to injuries sustained while on-duty".
"We do not have the suspect on file with U.S. Capitol Police", Acting Metro Police Department Chief Robert Contee said.
The death is the latest moment of sorrow for a department after the loss of Brian Sicknick, who clashed with rioters during the January 6 insurrection and died a day later, and Howard Liebengood, who committed suicide weeks after that. When I walk into my office, I greet and thank the guards for their service each and every day. "I'm heartbroken to learn of an officer's death in today's attack", tweeted Representative Angie Craig.
Police said the assailant was not previously known to them.
Police opened fire and the suspect is dead, Pittman said.
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