According to the agency, the Green exited the vehicle with a knife and ran toward other officers, who shot him.
"At this time, the suspect has been pronounced dead", Acting U.S. Capitol Police Chief Yogananda Pittman told reporters.
Following the attack, the Capitol complex went under a lockdown, less than three months after a mob attacked the building and clashed with the police.
Investigators are increasingly focused on Green's mental health as they work to identify any motive for the attack, said the official, who was not authorized to speak publicly about an ongoing investigation and spoke to The AP on condition of anonymity. Sections of surrounding roads have reopened for traffic.
He was 41 years old and served for almost two decades in the US Capitol Police Force. "Officer Evans had been a member of the United States Capitol Police for 18 years".
A security review requested by House Speaker Nancy Pelosi, D-Calif., in the aftermath of the riot and conducted by a task force recommended eventually replacing the barrier with mobile fencing and "an integrated, retractable fencing system" that could be used as needed.
Gov. Jim Justice, following a request from Joe Biden, issued a proclamation to fly all us and state flags on state property at half-staff through Tuesday evening.
"It's an eyesore, it sucks", Democratic Rep. Tim Ryan of OH, the chairman of a House spending committee that oversees security and the Capitol, said of the fencing in the hours after Officer Evans and the driver were killed. Miriam Carey's family said she suffered from postpartum depression with psychosis but was not unsafe.
The attack came months after the January assault on Congress by hundreds of supporters of then-president Donald Trump.
Five people died in the January 6 riot, including Capitol Police officer Brian Sicknick, who was among a badly outnumbered force trying to fight off the intruders.
The Congress is in recess and mostlawmakers are away.
Both officers were also taken to hospital, where one also died.
The police officer killed in a vehicle attack at the United States Capitol was a native of Western Massachusetts who was a high school athlete. "It looks bad to have the beacon of our democracy surrounded by razor wire and National Guard troops".
This story has been corrected by referring to Louis Farrakhan as the Nation of Islam's longtime leader, not its founder.
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