The lowered flags will honor United States Capitol police officers Brian D. Sicknick and Howard Liebengood. Another Capitol police officer who was on duty during the attack died by suicide days later.
The chief of the Capitol Police resigned after the building was invaded for the first time since 1814, and the Sergeants-at-Arms of both the House and Senate were forced to quit.
Earlier on Tuesday, the Federal Bureau of Investigation in New York City arrested another person in connection with the riots at the U.S. Capitol last week by supporters of President Donald Trump. "My thoughts are with their family and friends during this hard time". He said more details on the arrest would come later.
Speaking with BuzzFeed, the Capitol police officers asked to remain anonymous for their safety.
President Donald Trump has ordered the USA flag to be flown at half-staff as a sign of respect for two Capitol officers who died, as well as all members of law enforcement across the nation. "This is a tragic day".
Gov. Holcomb Directs Flags To Half-Staff In Honor Of Capital Police
Capitol Police officers held an emotional commemoration for Brian Sicknick, killed during last week's riots . This is routine, standard procedure whenever an officer deploys lethal force.
Chief Steven Sund had said Thursday that his resignation would be effective January 16, hours after House Speaker Nancy Pelosi (D-Calif.) publicly called on him to step down.
Andrew Myerberg, director of the OPA, said, "At this point, we are aware of two current SPD officers who are believed to have attended the protests in Washington, D.C., on Wednesday".
"Officer Liebengood was a patriot who dedicated his life to defending the Capitol and protecting all who served work in and visit this temple of our Democracy".
One of the two suspended officers reportedly took "selfies" with rioters while a second was accused of donning a Make America Great Again hat as he apparently gave instructions to the crowd, Mr Ryan said.
Sicknick died Thursday from injuries he sustained while on duty during the assault on the Capitol.