The chief federal attorney investigating the violent incursion into the Capitol said formal indictments are likely to be handed down this week.
As part of a sprawling investigation, the FBI is trying to identify more than 400 suspects.
Acting Attorney General Michael Sherwin said in a press briefing that more than 135 people were arrested in connection with the January 6 attack, which killed five people and forced members of Congress into hiding.
The vast majority of suspects are currently being arrested on the basis of criminal complaints, which allow the government to build a criminal case until it can be presented to a grand jury. A person cannot be convicted in federal court on the basis of a criminal complaint alone.
To date, only a few indictments have been confirmed by a jury. We are talking about accusations of more than 100 people in a variety of crimes – from minor, for example, illegal entry into the territory, to more serious, such as attacking a police officer or conspiracy.
“We continue to collect evidence related to these charges,” Sherwin said. “These people, who were indicted on the basis of federal criminal complaints, will face formal charges in the very near future, including this week.”
The FBI is trying to determine if the storming of the Capitol was pre-planned by some groups of people, and Sherwin said on Tuesday that he expects some will be charged with conspiracy to incite mutiny.
Earlier this month, his office accused three members of the far-right anti-government militia, the Oath Keepers, of conspiracy ahead of the siege of the Capitol.
The indictments in this case have not yet been made public.
According to Shervin, the investigation is starting to go to a more thorough level, given that the FBI has already managed to identify many “Internet stars” who bragged about their actions on social networks.
“We will reach the plateau,” he said. “This plateau will include the study of more complex conspiracy cases.”
Federal officials also said on Tuesday that investigations into the death of Capitol police officer Brian Siknik and the planting of two tube bombs at Democratic and Republican headquarters are ongoing.