Eight men were indicted on murder and terrorism conspiracy charges Thursday for their alleged roles in a thwarted drone and sniper attack on the UFC cage-fighting show staged at the White House in June.

The indictment, returned in Ohio, charges all eight in two separate conspiracies, one to provide material support to terrorists and a second to commit murder on federal government territory and to murder a federal government official.

According to the indictment, the plot began in May, when the group began amassing money, firearms, ammunition, body armor, explosives, drones, medical equipment, communications equipment and other items.

On 10 June, law enforcement officials learned about a possible threat to Donald Trump’s UFC cage-fighting show, four days before the mixed martial arts extravaganza.

The justice department announced federal charges against seven people last month from across the country, including from Ohio, Missouri, Washington, Nebraska and California. Officials said the group members harbored fringe conspiracy theories and hoped the attack would destabilize the government.

One of the defendants told investigators that they planned to fly explosive-laden drones into the event and then shoot panicked crowd members as they fled, according to a federal affidavit.

Tycen C Proper 19, of Danville, Ohio, and four others were arrested and charged in Missouri, Nebraska, and California the weekend of the UFC event, called Freedom 250. Two more defendants were charged and arrested by the FBI about a week later in Washington and Missouri. The justice department said the eighth man was charged this week.

The eighth defendant is Chandler D Scaggs, 21, of Chapmanville, West Virginia, who was taken into custody in that state. Scaggs was allegedly assigned to be one of the snipers in the plotted attack, according to an affidavit.

The affidavit said Scaggs was apparently to be picked up by Proper and taken to Washington but lost contact with Proper after he was arrested, the same as the others.

Scaggs allegedly signaled to the group that he was still willing to participate in the attack and arranged to travel to the event with another co-conspirator.