'Potentially Hazardous' Letters Hit Senators and Election Offices on Anniversary of Capitol Anthrax Attacks

More than 100 suspicious letters, some containing unidentified white powder, targeted US senators and election offices just weeks before the 2026 midterms; exactly 25 years after the Capitol Hill anthrax attack (Credit: Photo: Federal Bureau of Investigation/Wikimedia Commons Public Domain)

Federal investigators are tracing a wave of suspicious letters sent to senators, state election offices and other recipients across the US, some of them containing an unidentified powder.

More than 100 letters were mailed nationwide, according to officials briefed on the investigation, and offices in Louisiana and Arizona were partly evacuated.