Federal authorities are racing to intercept suspicious letters sent to election and congressional offices across the United States, widening an investigation that has already forced evacuations in at least two states just weeks before Election Day.
The mailings, some of which contained an unknown white powder, have drawn in the FBI, the U.S. Postal Inspection Service and U.S. Capitol Police. Authorities have not publicly identified a sender or confirmed that any of the substances are dangerous. No injuries have been reported.
The investigation has reached Washington
The investigation was first disclosed to Senate offices in a warning from the Senate Sergeant at Arms, according to The Associated Press. The notice said investigators were trying to intercept additional letters but cautioned that some could still reach their destinations.
The threat appeared limited to Senate offices on Capitol Hill as of Thursday, while the House was monitoring the situation, the AP reported. The FBI said the broader series of mailings had gone to addresses nationwide, including secretary of state offices and related election facilities.
Deputy Postal Inspector Brendan Donahue said investigators were working to identify whoever was responsible. That distinction matters: at this stage, authorities are describing an active criminal investigation, not attributing the letters to any political group or declaring the material toxic.
Three states report election-office mailings
In Oklahoma, the State Election Board said an envelope containing suspicious white powder arrived Tuesday morning. The office was evacuated while the Oklahoma Highway Patrol, Oklahoma City Fire Department and Oklahoma National Guard responded. State Election Board Secretary Paul Ziriax said no staff member was harmed and stressed that the incident would not interfere with election operations, according to the board’s official statement.
Louisiana’s election division also evacuated after an employee opened a letter containing a powdery substance. Initial field tests did not identify the material as harmful, but a sample was sent for additional analysis, according to reporting collected by electionline.
In Ohio, Postal Service investigators intercepted a suspicious package before it reached the secretary of state’s office. Ohio Secretary of State Frank LaRose said county election boards had been told to remain vigilant while the FBI handles the investigation.
Why the timing raises the stakes
The mailings surfaced roughly three weeks before the November 3 midterm elections, when election offices are handling registration questions, absentee-ballot requests, early-voting logistics and growing volumes of official mail. Even a substance that proves harmless can temporarily shut down a facility, pull staff away from election work and unsettle workers who have faced years of threats.
The National Association of Secretaries of State and the National Association of State Election Directors said in a joint statement that election administrators “should never fear for their safety.” The groups said offices have security measures and contingency plans designed to protect employees while keeping essential election operations running.
The pattern also echoes previous incidents. In 2023, election offices in six states received powder-filled letters; some contained traces of fentanyl and several disrupted local election work. Officials have not said the current letters are connected to that episode, and the history should not be treated as evidence about what is inside the new packages.
What remains unknown
Investigators have not announced how many letters were sent, which congressional offices were targeted, whether all of the envelopes share the same appearance or postmark, or whether laboratory testing has identified the contents. They also have not described a motive.
Those gaps make caution especially important. Images or claims circulating online may move faster than verified test results, but the known facts remain narrow: suspicious mail was sent to multiple government offices, some packages contained an unknown substance, and federal investigators are trying to find the sender or senders.
What offices are being told to do
Federal election-security guidance urges staff to isolate suspicious mail, avoid unnecessary handling and contact emergency responders rather than trying to inspect the contents themselves. The U.S. Postal Inspection Service, FBI, Cybersecurity and Infrastructure Security Agency and Election Assistance Commission have also published mail-handling procedures for election offices.
For voters, officials say the incidents have not changed election dates or procedures. The safest source for any operational update remains the relevant state or local election office. The central question now is whether investigators can intercept the remaining letters, determine what they contain and identify who sent them before the campaign’s final weeks grow even more tense.
