United States spy agencies warned in mid-March of an ongoing threat that racially motivated violent extremists, such as white supremacists, will carry out mass-casualty attacks on civilians while militia groups target police and government personnel and buildings. "Please keep the entire USCP and the family of the officer in your thoughts & prayers today", McKinley tweeted. "It is with a very, very heavy heart that I announce one of our officers has succumbed to his injuries", she told a news conference, her voice choked with emotion. "Thank you to all members of the USCP, who risk their lives each and every day to protect the U.S. Capitol and those inside".
Since then security officials have said there is an ongoing threat from extreme right groups and Trump supporters.
While Congress was on recess for the Easter holiday, text messages sent to staffers still working inside told them to avoid windows and said no one could enter or leave the building. Another two Capitol Police officers who responded to the pro-Trump riot committed suicide days later, and more than 140 of their colleagues were injured.
A auto crashed into a security barrier before the driver lunged towards the officers with a knife, police said.
Ryan said he and other top committee members, Democratic Rep. Rosa DeLauro and Republican Rep. Jaime Herrera Beutler, had been talking to the worldwide community about how they keep their facilities safe, including Israel's Knesset. Biden in a statement expressed condolences and said he ordered the White House flag to be lowered at half-mast.
Police investigate the scene after a vehicle charged a barricade at the US Capitol on 2 April in Washington, DC.
Evans was the seventh Capitol Police member to die in the line of duty in the department's history, according to the Officer Down Memorial Page, which tracks deaths of law enforcement.
Video posted online showed a dark colored sedan crashed against a vehicle barrier and a police K-9 dog inspecting the vehicle.
"I drive through this checkpoint and wave to the officers guarding it almost every day that I'm in Washington".
The Capitol buildings have been placed under lockdown, with nobody allowed in or out of the complex.
Friday's incident marks the second instance this year of deadly violence at the U.S. Capitol; five people died during or shortly after the January 6 insurrection at the legislative building.
U.S. Capitol Police officers stand near a auto that crashed into a barricade on Capitol Hill in Washington, April 2, 2021.
Dozens of National Guard troops, who have been stationed at the Capitol since the January attack, quickly deployed after the incident.