The DuPage County Sheriff's Office is investigating a suspicious letter that was received Monday afternoon at the DuPage County Circuit clerk's office.
According to a news release, an employee opened the letter about 1:15 p.m. and found an unknown substance enclosed with the correspondence.
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The clerk notified deputies assigned to the courthouse, who proceeded to secure the office, officials said.
The Wheaton Fire Department, members of the sheriff's HAZMAT team and Chicago-based FBI investigators responded to the scene and determined, through preliminary tests, that the powdery substance was not harmful.