Oklahoma Man Charged After More Than 700 Threatening Letters Were Sent to US Officials

A 67-year-old Oklahoma man is facing federal charges after investigators linked him to more than 700 threatening mailings sent to election officials, members of Congress, media organizations and other recipients across the United States.

The letters contained threatening messages, and many included an unknown white powder that prompted investigations by federal authorities. Laboratory testing identified the recovered powder as non-hazardous substances, including yeast and flour, according to the US Department of Justice.

Robin Patrick Martin, 67, of Oklahoma City, was arrested on November 2, 2026. He appeared in federal court the following day and was charged with conveying false or misleading information and hoaxes, along with mailing threatening communications.

What makes the case particularly unusual is the alleged use of invisible ink, threatening emails and hundreds of suspicious envelopes sent to people involved in the country's political and election systems.

More Than 700 Mailings Linked to One Suspect

According to an FBI affidavit, investigators connected more than 700 mailings to the same alleged sender. The recipients included state election boards, members of Congress from both major political parties, election pollsters, media organizations and federal law enforcement agencies.

The mailings were part of a series of incidents that investigators had been examining since 2024. The latest batch was sent ahead of the November 2026 midterm elections.

Letters were reportedly sent to election officials across all 50 states. Some were addressed using an outdated return address associated with the Democratic Socialists of America (DSA).

The organization also became part of the investigation after its members allegedly received threatening emails from someone using an account investigators linked to Martin.

The White Powder Turned Out to Be Harmless

Recipients of the suspicious envelopes initially had no way of knowing what the white powder inside contained. That uncertainty triggered emergency responses and investigations involving federal law enforcement and hazardous-material teams.

However, laboratory testing described in the FBI affidavit identified the recovered substances as harmless yeast or flour.

That finding did not make the incidents any less disruptive. Authorities had to investigate the mailings as potential threats, while recipients and public officials were left dealing with the possibility that the envelopes contained something dangerous.

According to the DOJ, the suspicious mailings created fear and diverted resources across multiple locations. Federal investigators also said the Postal Inspection Service recovered many of the mailings before they reached their intended recipients.

Some Letters Contained Messages Written in Invisible Ink

One of the more unusual details in the investigation was the use of ultraviolet-reactive ink.

Some envelopes reportedly contained messages that could not be read under ordinary lighting. Investigators needed ultraviolet light to reveal the writing.

The messages included threats involving treason arrests and other forms of punishment. Some also referenced an alleged organization called the United States Traitor Elimination Army.

According to the FBI affidavit, messages associated with the 2026 mailings included the warning "CIVIL WAR IS COMING ON NOVEMBER 3RD!!"

The investigation also uncovered emails allegedly sent to members of the Democratic Socialists of America. One message warned recipients that they could face arrest if they voted in the November 3 election.

Investigators believe the emails and physical mailings were connected to the same alleged sender.

Fingerprints, Surveillance Footage and Phone Records Helped Investigators

The investigation involved several types of evidence rather than relying on the suspicious envelopes alone.

According to the 33-page FBI criminal complaint, investigators identified three fingerprints belonging to Martin on a letter addressed to FBI Director Kash Patel.

Authorities also examined surveillance footage from postal facilities, vehicle records, phone data and other digital evidence.

Investigators traced an email account allegedly used by the sender and examined its connection to a prepaid phone purchased in Oklahoma City. They also reviewed footage and records that they say helped connect Martin to the mailing activity.

The FBI investigation further linked the alleged sender to suspicious mailings from 2024, suggesting the activity had continued across two election cycles.

Martin Faces Federal Charges as Investigation Continues

Martin faces federal charges of conveying false or misleading information and hoaxes, and mailing threatening communications.

The case is being prosecuted by the US Attorney's Office for the Western District of Oklahoma, with assistance from the Justice Department's National Security Division.

Several agencies participated in the investigation, including the FBI, US Postal Inspection Service, US Capitol Police, Oklahoma City Police Department and Texas Department of Public Safety.

According to Reuters reporting published on November 3, Martin was ordered temporarily detained pending a November 9 hearing.

The case now moves through the federal court system. Investigators have presented evidence linking Martin to the mailings, but the allegations have not yet been tested at trial.

Martin is presumed innocent unless proven guilty beyond a reasonable doubt in court.