A blue U.S. Postal Service mailbox in Phoenix, Arizona, was set on fire at approximately 1:20 a.m. local time Thursday morning, damaging several ballots and other pieces of mail, according to the Phoenix Fire Department.

Local law enforcement officials arrested a 35-year-old man in connection to the incident. He admitted to committed arson, but said it was not related to upcoming election, the Phoenix Fire Department said in a statement.

The mailbox was a drive-up collection box for mail at the Post Office at 3905 North 7th Avenue, according to Rob McDade, a spokesman for the Phoenix Fire Department. The fire was extinguished and the area has since been reopened.

McDade said that approximately 20 ballots were damaged. Arizona Secretary of State Adrian Fontes said in a statement that "many undamaged ballots" were recovered and that the affected voters would be contacted.

McDade said that the Postal Inspector took possession of the damaged mail.

Maricopa County Recorder Stephen Richer said in a statement that voters can check the status of their ballot at https://BeBallotReady.Vote.

“Successful delivery is usually reflected on that website within 72 hours. Voters should be aware that tomorrow, October 25, is the last day to request a replacement ballot,” Richer’s statement read. “If a voter believes they were impacted by this incident they can learn more about how to make that request at https://Request.Maricopa.Vote.”

Fontes, a Democrat, commended the local fire and police departments, as well as the Arizona USPS for their response. He noted that counties across the state have equipped ballot drop boxes with security controls designed to prevent physical attacks.