Here’s an update about a mysterious white substance that was discovered at the Millwood Post Office Friday.

Test results show the substance is non-biological and non-chemical. Millwood resident Rebecca Franklin opened her mail Saturday and found a white powdery substance in and on her mailbox.

Franklin took the substance to the Post Office, where she and several employees were de-contaminated by HAZMAT teams.

The Millwood office was closed Saturday morning until 11 o'clock, but mail was delivered on time to the community.

No arrests have been made in the case.