"I'm heartbroken for the officer killed today defending our Capitol and for his family". "Even though the attacker left the vehicle with a knife in his hand and had run towards the police officers", the Capitol Police was quoted as saying. Their name wasn't released.
Two law enforcement officials told The Associated Press that the suspect stabbed one of the officers.
The officials could not discuss the matter publicly and spoke to the AP on condition of anonymity. "We know what a hard time this has been for the Capitol, everyone who works there, and those who protect it".
But Washington Metropolitan Police Chief Robert Contee indicated that a terror link was not suspected at this stage.
The incident comes less than three months after the January 6 riot that exposed serious flaws in the Capitol's security apparatus.
The crash and shooting happened at a checkpoint near the Capitol as Congress is on recess.
The incident occurred about 91 metres from the entrance of the building on the Senate side of the Capitol.
The false election fraud claims incited Trump supporters to storm the Capitol on January 6 in an attack that resulted in the deaths of five people, including a Capitol police officer.
Authorities do not believe that the attack was terrorism-related.
In the 6 January attack, hundreds of extremist Trump-backers smashed into the Capitol building yelling threats against politicians and shutting down the legislature. Law enforcement is working to understand the motive behind this incident.
Unnamed officials familiar with the investigation confirmed to CNN, The New York Times and NBC News that the suspect was identified as Noah Green, 25, of Indiana. "Officer Evans had been a member of the United States Capitol Police for 18 years".
Pittman says the suspect rammed a barricade near the US Capitol.
But the attack underscores that the building and campus - and the officers charged with protecting them - remain potential targets for violence.
Per the DC Fire and EMS scanner, three individuals were picked up from Capitol Hill, including two police officers.
It took hours for the National Guard to arrive, a delay that has driven months of finger-pointing between key decision-makers that day. "On behalf of the entire House, we are profoundly grateful", Pelosi added.
The suspect had been taken to the hospital in critical condition. Per journalists present at the site, Capitol Hill has been placed on lockdown due to an "external security threat".
National Guard troops were mobilised 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 local time.
Television footage showed a blue sedan that had crashed into a security barrier on one of the streets leading to Congress, as what appeared to be the injured officers were loaded onto gurneys and into ambulances.