The FBI has arrested two additional suspects, Jordan W. Rincker and William Falkner, bringing the total number of defendants to seven in the foiled mass-casualty plot targeting President Trump’s White House UFC event on June 14.

Newly unsealed court records allege the attackers planned to use drones to drop explosives into the crowd before sniper teams opened fire on people fleeing the scene. Prosecutors say Rincker accepted $1,200 from alleged ringleader Abraham Alvarez, traded a pump-action shotgun, used a 3D printer to produce weapon components, and sought to obtain explosives.