NASHVILLE, Tenn. (AP) — The Department of Justice said Monday that federal agents have arrested a Tennessee man with ties to white nationalist groups who they say attempted to use what he believed to be an explosive-laden drone to destroy a Nashville energy facility. According to court documents, 24-year-old Skyler Philippi is accused of planning to attach several pounds of C-4 explosives to an aerial drone with the intent of destroying an electric substation in Nashville.

The newly unsealed court records reveal that Philippi in July allegedly told a confidential source who was working with the FBI that he wanted to attack several substations to “shock the system.” That confidential source later introduced Philippi to an undercover FBI employee, who began to collect information about Philippi’s plan with other undercover agents. “Philippi researched previous attacks on electric substations and concluded that attacking with firearms would not be sufficient,” wrote Angelo DeFeo, an FBI special agent, in the court records released Monday.

“Philippi, therefore, planned to use a drone with explosives attached to it and to fly the drone into the substation.” Philippi allegedly told undercover law enforcement officials that he was affiliated with several white nationalist and extremist groups, including the National Alliance, which calls for eradicating the Jewish people and other races. Such extremist groups increasingly have viewed attacking the United States’ po.