An agent with the Postal Inspection Service confirmed there is an ongoing investigation involving letters sent to several police departments across the state of Alabama last week.
Officials could not comment further because it is an ongoing investigation.
Sheffield, Tuscumbia and Muscle Shoals police departments all received a similar letter postmarked from California. Officials said those letters have been turned over to the Postal Inspector for further investigation.
According to sources, other letters were sent to departments in South Alabama.
Some of the letters are believed to have contained some sort of chemical substance, which has not been identified.
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