A sprawling, multi-state FBI operation has dismantled a highly coordinated domestic terrorism network plotting a mass-casualty assault at the White House, according to the U.S. Department of Justice (DOJ).

The targets were federal lawmakers and thousands of spectators attending the historic "UFC Freedom 250" fight on the South Lawn, per a press release.

The five primary suspects, all American citizens, were intercepted during a series of high-risk weekend raids across four states.