A newly unsealed indictment on Sunday named additional members of the Oath Keepers, a far-right militia group that participated in the storming of the U.S. Capitol, as defendants for their role in the January 6th incident.

The court filing listed three individuals by name, Joseph Hackett, Jason Dolan, and William Isaacs, while a fourth person's name was hidden. Three of them have been arrested in recent days, court records show. It was unclear why the fourth person's name was not revealed in the court documents.

This superseding indictment, part of a larger federal government criminal conspiracy case, now includes a total of 16 Oath Keepers. The other 12 co-defendants have pleaded not guilty.

Prosecutors have said in recent weeks that others members of the militia group planned to commit violence and brought firearms into the city.