Federal Agencies Investigate Letters With Suspicious Substances Sent to Congressional Offices
Federal agencies are investigating multiple letters containing suspicious substances that were mailed to Congressional offices nationwide.
San Francisco Oakland San Jose, CA, October 16, 2026 —
Federal agencies are investigating multiple letters containing suspicious substances that were mailed to Congressional offices nationwide, according to the available information about the matter.
The reported scope is national: the letters were sent to Congressional offices in multiple parts of the country. The number of letters, the offices that received them and the substances involved have not been provided. No dates for the mailings or investigation were included.
The information also does not identify the agencies conducting the investigation or describe what steps they are taking. It does not say whether any recipients or other people were exposed to the substances, whether anyone was injured, or whether officials have determined what the materials were.
No details have been provided about who sent the letters or whether investigators have identified a motive. The available account does not state whether the letters were connected to one another, or whether authorities have announced any findings.
As a result, the known facts remain limited to the existence of multiple letters, their delivery to Congressional offices nationwide and an ongoing investigation by federal agencies. Further details about the mailings, the substances and the investigation were not included in the information provided.
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