The Department of Justice (DOJ) has added four defendants to its conspiracy case against the Oath Keepers related to the Jan. 6 attack on the U.S. Capitol, CNN reported on Sunday, citing a new indictment made public in D.C. District Court.

The new defendants were identified as Florida residents Joseph Hackett, Jason Dolan and William Isaacs. A fourth person’s name and alleged actions were redacted, CNN reports.

The DOJ has been building its case against the far-right extremist group since a group of supporters of former President TrumpDonald TrumpBarbra Streisand: Republicans ‘want an authoritarian state’ DOJ adds four defendants to Oath Keepers conspiracy case J.D. Vance emerges as wild card in Ohio GOP Senate primary MORE breached the Capitol in an attempt to stop Congress from certifying President BidenJoe BidenTexas Democrats stage walkout to block passage of sweeping election overhaul package DOJ adds four defendants to Oath Keepers conspiracy case Biden remembers late son Beau in Memorial Day remarks MORE‘s Electoral College victory. At least a dozen people allegedly associated with the Oath Keepers face charges alleging they not only took part in the attack but coordinated their actions beforehand and communicated during the event.

Five previously named defendants are facing additional charges for allegedly deleting their social media or cell phone activity, according to the newly unsealed indictment, CNN reported.

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The conspiracy case is the largest against any far-right extremist group that participated in the insurrection at the Capitol that left five people dead including a Capitol police officer, according to CNN.