The FBI arrested an Oklahoma City man early Monday on suspicion of sending hundreds of letters containing suspicious white powder to public officials across the country. A federal law enforcement source provided details of the arrest to Fox News Digital.

The letters were allegedly sent during the 2024 and 2026 election cycles. Their reported destinations included election offices and other government offices across the nation, placing federal and local authorities on alert.

The suspect was expected to make an initial court appearance Tuesday afternoon. The federal law enforcement source said the letters had been sent to more than 100 locations.

Multiple secretary of state offices and election offices were among the reported destinations. Authorities were investigating a sweeping series of mailings that reached officials responsible for elections as well as members of Congress.

Trump's Sovereign Wealth Fund: What Could It Mean For Your Money?

The FBI’s Oklahoma City field office and FBI Criminal Division led the investigation with several other agencies. The U.S. Postal Inspection Service, U.S. Capitol Police and the Oklahoma City Police Department also participated.

The arrest came while federal authorities were investigating suspicious letters mailed to congressional and election offices before the 2026 midterm elections. Officials had also been working to intercept more letters before they reached their destinations.

Last month, the FBI said it was working with the U.S. Postal Inspection Service to investigate the mailings. The agency described the matter as “a series of suspicious mailings sent to various addresses nationwide, including Secretary of State offices and their related election offices,” according to The Associated Press.

Authorities warned recipients to treat the mailings as “potentially hazardous” while the investigation proceeded, the outlet reported. That warning accompanied efforts by authorities to locate and intercept additional suspicious letters moving through the mail.

FREE Gun Law Map: Laws Don't Pause During Social Unrest

The FBI addressed the substances in an Oct. 23 advisory. According to the agency, no hazardous material had been identified in the suspicious substances tested at that point, although laboratory testing remained ongoing.

Several Senate offices reported either receiving suspicious mail or learning that mail addressed to them had been intercepted. Capitol Police and postal authorities stopped some of those letters before they reached the intended Senate offices.

A letter addressed to Sen. Lisa Blunt Rochester’s Delaware office was intercepted by Capitol Police. Suspicious mail addressed to the offices of Sen. Alex Padilla of California and Sen. Kirsten Gillibrand of New York was intercepted by postal authorities, The Associated Press reported.

The reported mailings stretched beyond congressional offices and included election operations in numerous states. Similar suspicious letters were sent to election offices in more than 15 states during the 2024 election cycle, according to an Associated Press report from that period.

Those earlier letters triggered evacuations and responses from hazardous materials teams. Authorities later determined that some of the substances contained in the letters were harmless.

The current investigation involved a network of agencies responsible for federal investigations, postal security, Capitol security, and local policing. Their work focused on the hundreds of letters allegedly tied to the Oklahoma City suspect.

Federal authorities had continued investigating suspicious mail sent ahead of the 2026 midterm elections when the arrest was made. The suspect had not yet appeared for the initial court proceeding expected Tuesday afternoon.

The federal law enforcement source tied the suspect to mailings from both the 2024 and 2026 election cycles. With more than 100 locations reportedly targeted, the case covered election offices, secretary of state offices, and public officials nationwide.

The opinions expressed by contributors and/or content partners are their own and do not necessarily reflect the views of Objectivist. Contact us for guidelines on submitting your own commentary.