Mark Prieto, 58, had seven guns when he was arrested on May 14 while driving east from Arizona through New Mexico, the US Attorney’s Office for the District of Arizona said in a news release Tuesday. He faces charges of firearms trafficking, transfer of a firearm for use in a hate crime and possession of an unregistered firearm, the release said.

The indictment against Prieto alleges he discussed his plans between January and May with two people whom he believed “shared his racist beliefs,” unaware they were working with the FBI, the US Attorney’s Office said. He then sold an AK-style rifle and an AR-style rifle to one of those individuals within the span of a month, all while under FBI surveillance, the release said.

Prieto was targeting a concert scheduled for May 14 and May 15 at State Farm Arena in downtown Atlanta, according to a statement of probable cause attached to the federal complaint. While it does not specify whose concert Prieto allegedly targeted, a schedule for the venue shows Puerto Rican rapper and singer Bad Bunny was slated to perform there on those dates.

After his arrest, Prieto denied he was going to Atlanta, but he did admit to knowing the two people who were working with the FBI, and told agents he had no intentions of carrying out the attack, the federal complaint states. CNN has reached out to Prieto’s public defender in New Mexico for comment.

If convicted, the charges of firearms trafficking and transfer of a firearm for use in a hate crime each carry a maximum sentence of 15 years in prison and a $250,000 fine, the US Attorney’s Office said. A conviction for possession of an unregistered firearm carries a sentence of up to 10 years and a $250,000 fine.

Indictment outlines monthslong undercover operation

One of the individuals Prieto confided in was an undercover FBI agent, while the other was a confidential source who’d spoken with Prieto more than a dozen times at different gun shows over the last three years, according to the complaint. That source told the FBI in late 2023 that Prieto had made comments advocating for a mass shooting targeting “blacks, Jews, or Muslims,” the complaint says.

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