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Man charged with mailing threatening letters with white substance to members of Congress

Investigators say the envelopes contained harmless substances and notes, and more than 100 possible white-powder letters are circulating in the U.S. mail system.

  • On Monday, federal authorities charged Matthew Unglesbee, 37, of Quincy, Illinois, with sending threatening letters containing white powder to four members of Congress in Chicago.
  • Unglesbee allegedly mailed the letters after hearing news reports about similar white-powder mailings earlier this month, admitting he knew recipients would perceive the threats as serious.
  • Using law enforcement guidance, Congressional staffers identified suspicious envelopes and found substances like salt with notes reading "HAH enjoy the gift" before contacting the Chicago Police Department.
  • When federal agents interviewed Unglesbee at his home on Sunday, they discovered a fifth envelope addressed to one of the member's Washington, D.C. office.
  • Law enforcement sources told ABC News that more than 100 possible white-powder letters are circulating within the U.S. mail system, prompting Chicago Democrat Mike Quigley to condemn political violence.
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NBC Dallas-Fort Worth broke the news in Fort Worth, United States on Monday, October 26, 2026.
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