Federal investigation of letters with suspicious substances widens

Dozens of letters containing an unknown white powder were mailed nationwide to elected officials and government offices. Federal officials are treating the incidents as potentially connected. Most, if not all, letters sent to senators were intercepted before delivery, and no injuries were reported.

Republican targets included Sens. Susan Collins and Mike Rounds, along with other unnamed Senate Republicans. At least 15 congressional offices of Democrats were also targeted. On Friday, several additional Democratic representatives reported letters at their home-state offices. The targets included election offices in at least 26 states.

The letters reached or were directed toward offices in places such as Portland, Washington, D.C., and Sioux Falls. Staff alerted police or followed Capitol Police guidance after noticing suspicious mail. Investigators have not identified the sender or traced the letters’ exact origins, while testing so far has found no hazardous powder.

Here, a suspicious substance means the unknown white powder found in mailed letters or packages sent to officials’ offices. The article does not identify the material. It reports only that preliminary field testing found the tested powder was not hazardous so far.

An unknown powder requires caution because recipients cannot safely judge its identity by appearance. Until testing confirms what it is, staff and responders must consider that it could pose a health risk. That uncertainty explains why letters were intercepted, warnings were issued, and law enforcement continued testing.

The FBI and U.S. Postal Inspection Service were leading the investigation. Further testing was planned at law enforcement laboratories. The article gives no chemical description or confirmed motive, so the substance remains an investigative question even though early results were reassuring.

The investigation covers a much wider campaign than a few isolated packages. At least 26 state election offices and at least 15 congressional offices of Democrats were identified as targets. The article also reports that Republican senators were targeted, although the names of several were withheld.

One source described “dozens and dozens” of letters sent nationwide with the same general description. Seven identified Democratic targets were senators, including Senate Majority Leader Chuck Schumer. Additional Democratic representatives reported suspicious letters at offices in their home states on Friday.

The exact total remains unknown. State offices in 26 named states had received packages by Friday afternoon, but officials had not determined how many offices were targeted overall. Investigators were still tracing the letters’ origins and the person or people responsible, with laboratory testing still ahead.

The FBI and U.S. Postal Inspection Service are the two lead agencies investigating the mailings. Their work matters because the incidents involve both possible threats to public safety and letters sent through the postal system. The article does not assign separate public roles to the agencies.

Investigators are trying to trace the letters’ exact origins and identify the person or people who mailed them. They are also conducting preliminary field tests on the unknown substance. Most senator-bound letters were intercepted, allowing authorities to examine them before delivery.

Further testing was scheduled at law enforcement laboratories. Officials had not found the sender or confirmed a hazardous substance by Friday. As more letters are reported, investigators can compare their descriptions and test results while determining whether the mailings form one connected case.

Threatening mail can create fear and disruption inside election offices and congressional workplaces. Staff may need to stop normal operations, alert police, and handle packages as possible hazards. The timing matters because the mailings came less than three weeks before Election Day, when election offices are especially busy and visible.

For example, Rounds’ Sioux Falls team contacted police after seeing Capitol Police guidance about other intercepted letters. Collins’ letters were intercepted before arrival, and no one was injured. These responses show how warnings can change staff behavior even before a substance is identified.

The article does not measure public confidence or report lasting closures. Still, it links the mailings to a broader rise in threats against election workers and cites similar incidents in 2023 and shortly before the 2024 presidential election. Continued unexplained mailings could increase pressure on offices and staff.

Federal officials are approaching the incidents as potentially connected because many letters reportedly matched the same description. They contained an unknown white powder, were sent nationwide, and appeared at state election offices and congressional offices. Sources also described the volume as “dozens and dozens.”

A confirmed connection would require evidence tying separate letters to the same operation. Investigators could compare envelopes, postmarks, addresses, handwriting, packaging, powder composition, and other forensic material. They could also examine postal records or other investigative evidence linking the mailings. The article does not say which of these comparisons have been completed.

For now, the link remains an investigative assessment, not a proven conclusion. Authorities have not traced the exact origins or identified the sender or senders. Laboratory testing and continued examination of intercepted letters could clarify whether the mailings share a common source.

Postal and public-safety systems manage suspicious mail by separating it from people and ordinary workplace activity. The article specifically reports that letters were intercepted, staff received warnings, police were alerted, and field testing continued. It does not describe every protective step or the equipment used.

The basic mechanism is controlled handling. Trained responders limit contact, isolate the package, document it, and collect a sample for analysis. Testing can begin in the field, while more definitive work occurs in specialized law enforcement laboratories. These measures reduce unnecessary exposure while helping identify the substance and its risk.

In this case, preliminary field tests found that all tested powder was not hazardous so far. Further testing was still planned. The FBI and Postal Inspection Service were leading the investigation, but the article does not say whether any office was evacuated or describe specific protective gear.