SPOKANE, Wash.-- Preliminary results show two suspicious letters sent to a Downtown Spokane post office were laced with ricin.

The American Postal Workers Union said one letter was addressed to the Spokane Post Office; the other was addressed to a federal judge in Spokane. Both letters were postmarked May 14.

The organization added there is no reason to believe any employees are at risk from handling the letters. Results show the ricin was not in a form that could be inhaled or ingested.

The Seattle division of the FBI confirmed Thursday it is aware of threatening letters sent to a postal facility in Spokane on Wednesday.

The FBI is working with law enforcement partners including USPIS [United States Postal Inspection Service] to investigate the source of the letters, said FBI spokesperson Ayn Sandolo Dietrich.

Law enforcement agencies are continuing to assess and address potential threats but are not aware of any other letters.

The GSA says the post office facility is still open but operating with appropriate precautions.

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