Three shootings occurred between Sept. 16 and Oct. 6, according to the Tempe Police Department.
Jeffrey Michael Kelly, 60, is accused of initially using a carbon dioxide-powered gun to shoot at the office and then using firearms in subsequent incidents. More than 20 shots were fired at the office throughout the three shootings, causing damage to the building’s windows, front doors, and walls.
The office was shut down after the third shooting.
He is currently being held on two $500,000 cash-only bonds, the Maricopa County Attorney’s Office said in the statement.
The shootings all took place shortly after midnight, and no one was inside the building during the incidents. No injuries were reported.
Following the shootings, Tempe police released surveillance footage of a vehicle believed to be connected to the suspect, leading to his arrest and indictment.
Tempe Police Chief Kenneth McCoy said last week that Kelly also had been observed posting anti-Democrat signs in the area. Kelly was arrested on Oct. 22, McCoy said.
Authorities have not yet disclosed a motive for the shootings.
Kelly allegedly had more than 200 guns and more than 250,000 rounds of ammunition in his home, the state prosecutor said.
Bhatia said the size of the weapons cache led authorities to believe he “was preparing to commit an act of mass casualty.”
Squires could not be reached for further comment.
The Tempe site is one of 18 field offices in Arizona that organizes campaign efforts for Vice President Kamala Harris, the Democratic presidential nominee.