Federal agents are racing to intercept letters carrying an unknown substance mailed nationwide to congressional and state election offices, a probe that lands on the 25th anniversary of the 2001 anthrax attacks.
Federal law enforcement is racing to intercept a wave of suspicious letters carrying an unknown substance that were mailed to congressional offices and state election offices across the country, an urgent investigation that broke Thursday as the midterm election season entered its final stretch.
A notice from the U.S. Senate Sergeant at Arms warned senior Capitol Hill staff that "multiple letters containing suspicious substances" had been sent to addresses nationwide, including multiple congressional offices. The FBI, the U.S. Postal Inspection Service and U.S. Capitol Police are investigating.
"Law enforcement officials are working to intercept any additional letters before they are delivered, however, it is possible that some letters may reach their destinations," the notice read.
An FBI spokesperson said agents and postal inspectors are pursuing "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 spokesperson said. "We are also working with our partners to identify the individual or individuals responsible for the letters."
Deputy chief postal inspector Brendan Donahue confirmed the probe at a press conference Thursday, saying flatly that "any threat or attack on an election official is unacceptable." The warning went out to chiefs of staff, administrative managers and state directors, a sign of how seriously the Senate is treating the mailings.
Officials said it was not immediately clear which lawmakers or which states were targeted. Some of the letters were intercepted at other addresses before reaching their intended destinations.
The targeting of Secretary of State offices and their election divisions is especially pointed. Those are the offices that run voter registration, ballot custody and the counting of results -- the exact machinery Democrats and the legacy media insist is under no meaningful threat. The mailings land weeks before the midterms, in a season already consumed by court fights over mail-ballot integrity and the push for commonsense election safeguards.
The Senate warning included a photograph of one of the suspicious envelopes. It carried a return address at a Financial District building in New York City -- 75 Maiden Lane -- that the Democratic Socialists of America (DSA) formerly listed on its membership forms.
It is unclear whether the DSA had any involvement in sending the letters. The organization did not respond to a request for comment. A representative told reporters that "DSA has not occupied this office address since 2013" and that the group is "no longer headquartered at 75 Maiden Lane."
The notice cautioned that "all suspicious letters, packages, or substances should be treated as potentially hazardous." The mailing spree was first reported by Punchbowl News, and the FBI declined to confirm specific letters, citing the active investigation.
The scare lands on the 25th anniversary of the 2001 anthrax attacks, when a letter laced with the deadly bacteria was opened in then-Senate Majority Leader Tom Daschle's office on Oct. 15, 2001. Those mailings killed five people and sickened at least 17 others, and forced the costly decontamination of a Senate office building.
Congressional mail has been handled with extraordinary caution ever since, and members of both parties have treated suspicious letters as a security matter rather than a political talking point. Letters containing ricin, a poison, were mailed to Senate offices in later years as well, though no deaths resulted.
The threat this time reaches far beyond Capitol Hill. State and county election offices sit at the center of a decentralized system with thousands of local administrators and tens of thousands of poll workers, and a single credible mailing can shut down an office and stall the work of preparing ballots in the closing weeks of a campaign.
The Postal Inspection Service and the FBI are now hunting for the person or people behind the mailings, and a single arrest would likely follow if agents can trace the envelopes back to a sender. In the meantime, congressional offices and state election directors are on high alert, instructed to isolate anything that looks off and hand it to law enforcement rather than open it.
The episode also sharpens a message the Trump administration and Republican election officials have pressed for months: that election integrity and the physical safety of the people who administer elections are two halves of the same job. Protecting the vote, in that view, means guarding both the ballot and the ballot box -- and the workers who stand between them.
For now, the public case is a manhunt. Federal officials say the investigation is active and ongoing, and they are urging anyone who receives a suspicious envelope not to handle it and to contact authorities immediately. With early voting already underway, how quickly agents can shut the mailing spree down will shape the final weeks of the 2026 midterms.
Federal agents are racing to intercept letters carrying an unknown substance mailed nationwide to congressional and state election offices, a probe that lands on the 25th anniversary of the 2001 anthrax attacks.
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