Federal authorities announce additional charges in an alleged plot to carry out a mass-casualty attack tied to UFC Freedom 250, an event held in front of the White House earlier this month. Multiple outlets report that arrests and new charges bring the total number of defendants to seven. The FBI and prosecutors describe the alleged plan as involving explosive drones, with some reporting also describing additional elements such as plans to target government officials at the event. According to court and prosecution accounts cited by the outlets, two more men are charged in connection with the plot; ABC News and other reports say the latest defendants include people from Missouri and Washington. One outlet says an additional suspect is identified by the FBI as part of the same investigation. Authorities also describe at least one figure as a leader or “ringleader” in the case, with reporting that the individual remains in custody. Another account says one suspect describes an intent to cause chaos with the goal of overturning the U.S. government. Prosecutors contend the plot was foiled before it could be carried out, and the charged individuals face criminal proceedings in federal court.