LVMPD investigating employees who may have participated in Capitol riot

Joe Biden embarks on a train campaign tour

Federal prosecutors are looking at bringing "significant" cases involving possible sedition and conspiracy charges in last week's riot at the U.S. Capitol.

Michael Sherwin, acting USA attorney for the District of Columbia, held a press conference where he described the Capitol building as a "crime scene", and said his agents were working with the Federal Bureau of Investigation to find hundreds, if not thousands, more people who will be arrested.

"We're looking at significant felony cases tied to sedition and conspiracy", Sherwin said.

The FBI says 70 people have been arrested and 100 other suspects identified after last week's Capitol riot-and that's just the "tip of the iceberg".

"And as mentioned, with this strike-force to focus strictly on sedition charges, we're looking at, in creating this, just like a significant global counterterrorism or counterintelligence operation, we're looking at everything", Sherwin said.

D'Antuono was among the officials who suggested law enforcement had simply been caught off guard, saying on Friday: "There was no indication that there was anything other than First Amendment protected activity".

At least some of the arrests already made are part of a strategy used in counterterrorism investigations, to find even a minimal charge and try to take a person of concern off the streets.

United States political historian and author Michael Beschloss summed up the backlash online, asking: "What do the Acting Attorney General and FBI Director have to do that is more important than appearing at this public briefing on the Capitol attack?"

Defense and National Guard officials, including McCarthy, have said in interviews over the past several days they were told by D.C. that they believed the protests would be similar to the ones on November 14 and December 12. They had timers. We don't know, obviously, why they did not go off. But US Capitol Police did not bolster staffing and made no preparations for the possibility that the planned protests could escalate into massive, violent riots, according to several people briefed on the law enforcement response.

Biden became known for riding the train starting from his very earliest days in the Senate, when he made a point to return home almost every night to help raise his young sons after his wife and young daughter died in a auto accident in 1972. The scene also undermined the hallmark of the republic - the peaceful transition of power.

Former FBI director James Comey appeared on "The Late Show With Stephen Colbert", Tuesday, where he discussed the recent attack on the Capitol building which left five people dead.