The US Justice Department announced Friday that it has charged 15 people involved in the assault on Congress, including one man accused of possessing bombs.

Washington US attorney's office said they did not expect to charge anyone with "incitement" or "insurrection" in Wednesday's violence.

The department unveiled the cases against 13 people, including Richard Barnett, who invaded the office of House Speaker Nancy Pelosi.

Most of the 13 were charged with illegal entry into restricted buildings of Congress, and violent or disorderly conduct. More charges and arrests were expected.

Around 40 people were arrested and charged by local Washington police, mostly for curfew violations, weapons offenses and unlawful entry.