The FBI arrested two more men over their alleged involvement in a planned drone attack on the White House’s UFC event.

Five people were arrested and charged as co-conspirators as part of the plot, which aimed to use drones to assassinate White House officials and cause a mass casualty event at the spectacle just ahead of the U.S.’s 250th anniversary. William Lee Spartacus Falkner was arrested in Washington on Friday, and Jordan Rincker, 28, was arrested on Sunday in Missouri. Both are being charged with conspiracy to commit murder, a charge that carries the possibility of life in prison.