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Nov. 3, 2026 11:26 AM PT

OKLAHOMA CITY — Federal authorities charged an Oklahoma City man with sending hundreds of letters containing nonhazardous white powder to public officials ahead of the 2024 and 2026 elections.

The powders turned out to be yeast or flour, though not all letters have been fully tested, the FBI said in a court filing made public Tuesday.

Robin Martin is charged with conveying a hoax and mailing threatening communications. Martin was arrested Monday and was expected to make an appearance Tuesday in U.S. District Court in Oklahoma City.

Online records do not list an attorney who could comment on his behalf, and several relatives didn’t immediately respond to social media messages seeking comment.

Federal authorities announced last month that they were investigating letters with “suspicious substances” that had been mailed to congressional and election offices nationwide and urged recipients to treat the mailings as “potentially hazardous.”

The packages led to the evacuation in October of election offices in Louisiana and Oklahoma. Numerous states, from Idaho to Florida, said their election offices either received letters or had them intercepted by the Postal Service.

Investigators believe more than 700 mailings appeared to be associated with the same sender. They were addressed to election officials, members of Congress, pollsters, news media and federal law enforcement, FBI agent David Cole said in an affidavit.

The investigation stretched back to 2024 when multiple election officials in every state reported mail with a white substance and a three-page letter declaring war, the FBI said. Some bore ominous messages that could only be read under ultraviolet light.

The sender wrote a return address as “U.S.T.E.A., United States Traitor Elimination Army, Takoma Park, MD.”

A common message in the 2024 and 2026 mailings was a warning to recipients about upcoming arrests for treason “or worse!!”

The FBI said it has video evidence of Martin’s car stopping in October at mailboxes at Postal Service sites in Oklahoma City, Dallas and San Antonio. Investigators also gleaned his fingerprints from a letter addressed to FBI Director Kash Patel, whose first name was written as “Kashyap.”

The Democratic Socialists of America apparently assisted the FBI in the investigation. The FBI said it believes Martin, posing as someone using the name George Livingston, posted a message to a DSA email list in October, warning that members were traitors and eligible for arrest for treason if they vote in the Nov. 3 election.

White and Hollingsworth write for the Associated Press. AP journalist Alanna Durkin Richer in Washington contributed reporting.

SPRINGFIELD, Ill. — A 37-year-old Illinois man is charged with sending threatening letters to members of Congress containing a white powder, including one with a note reading “HAH enjoy the gift,” according to federal court records.

The criminal complaint unsealed Monday claims Matthew Ungelsbee sent at least four plain white envelopes with a powdery substance to elected officials in Chicago. They were postmarked in Springfield, Illinois, on Oct. 19 and had Unglesbee’s name handwritten in the return address section.

Unglesbee, of Quincy in southwestern Illinois, is charged with mailing threatening communications and perpetrating a hoax. He was scheduled to appear in court Monday afternoon. Court records did not list a defense attorney, and a phone number for Unglesbee could not be found. A Facebook message to a Matthew Unglesbee in Quincy was not immediately returned.

FBI agents interviewed Unglesbee at his home on Sunday and he told them all the letters contained salt, court records show. He claimed he’d sent the letters after hearing someone talk about similar mailings in the news earlier this month.

Testing confirmed the white substance was not dangerous. The records did not identify the substance.

A motive was unclear. But Unglesbee said he knew the congress members would “take it serious” because the powder might be perceived as anthrax, which he knew was dangerous and could prompt a response by hazmat teams, according to the complaint.

“Unglesbee claimed he was joking but recognized the recipients would not know he was joking and could perceive it as a threat,” the complaint stated.

Investigators said none of the recipients opened the letters. The most recent envelope was received Oct. 23 at the office of a U.S. senator, records show. It contained a white powdery substance and a handwritten note reading “HAH enjoy the gift,” according to the documents.

The investigation began after an anonymous tipster reported overhearing Unglesbee in a restaurant talking about mailing a suspicious substance to members of Congress. The tip was received Oct. 16, and the FBI tracked Ungelsbee down after the envelopes arrived at the congressional offices days later.

The recipients of the mailings were not named. Authorities searched Unglesbee’s home and found a fifth envelope addressed to another congress member’s Washington, D.C., office, the records show.

Earlier this month, federal authorities said they were investigating letters with “suspicious substances” that had been mailed to congressional and election offices nationwide. That investigation by the FBI, the U.S. Postal Inspection Service and U.S. Capitol Police was first disclosed in a message from the Senate Sergeant at Arms obtained Oct. 15 by the Associated Press.

Unglesbee denied involvement in those mailings.

Oct. 15, 2026 Updated 9:38 AM PT

WASHINGTON — Federal authorities are investigating letters with “suspicious substances” that have been mailed to congressional and election offices nationwide and are urging recipients to treat the mailings as “potentially hazardous.”

The investigation by the FBI, U.S. Postal Inspection Service and U.S. Capitol Police was first disclosed in a message from the Senate Sergeant at Arms obtained Thursday by The Associated Press. The notice, sent to Senate offices, said that law enforcement officials were working to intercept any additional letters, but “it is possible that some letters may reach their destinations.”

In Congress, the threat appeared limited to the Senate, though the House was monitoring the situation, according to a person familiar with the matter who was not authorized to discuss the investigation publicly.

An FBI statement said the bureau and the Postal Inspection Service were “investigating a series of suspicious mailings sent to various addresses nationwide, including Secretary of State offices and their related election offices.”

“Some of the letters contained an unknown substance and we are working closely with our law enforcement partners to respond to each incident,” the statement read. “We are also working with our partners to identify the individual or individuals responsible for the letters.”

Mailed packages containing a powdery substance led to the evacuation this week of election offices in at least two states, Louisiana and Oklahoma. The Ohio secretary of state said the Postal Service intercepted a package containing a white powder intended for its office and noted that similar mailings had been sent to election officials in multiple states.

News of the letters comes just three weeks before Election Day and is reminiscent of a similar threat in 2023, when election offices in six states received mailings that contained a white powder. In some cases, the incidents disrupted work around local elections.

Some of those letters contained threats and traces of the powerful opioid fentanyl, leading some election offices to stock up on the overdose reversal medication naloxone.

The National Association of Secretaries of State and the National Association of State Election Directors issued a joint statement condemning what they said were threats against election staff.

“Those who administer our elections should never fear for their safety while carrying out their essential duties,” they said in their statement.

Deputy Postal Inspector Brendan Donahue told reporters Thursday that “any threat or attack on election officials is unacceptable” and that “we are also working with our partners on identifying the individual or individuals responsible for the letters.”

Mascaro and Cappelletti write for the Associated Press.