# Federal probe widens into suspicious-substance letters sent to officials’ offices

https://mins.news/en/item/103755

- NBC News, 2026-10-16 21:07 UTC
- Politics
- Original: https://www.nbcnews.com/politics/congress/federal-probe-suspicious-substance-letters-widens-gop-senators-rcna603950

> A person with direct knowledge of the investigation told NBC News on Friday that a federal inquiry into letters containing unknown substances, mailed to elected officials’ offices, has expanded. Some Republicans have been identified as targets of the mailings.

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- [FBI investigates suspicious letters mailed to congressional offices](https://mins.news/en/video/102278) — Fox News, 2026-10-15
- [Authorities investigate letters containing ‘suspicious substances’ sent to congressional and election offices](https://mins.news/en/item/101756) — ABC News, 2026-10-15
- [Authorities investigate letters containing ‘suspicious substances’ sent to congressional and election offices](https://mins.news/en/item/101727) — The Associated Press, 2026-10-15