Provincial Police in Tecumseh are looking for answers after more than 90 community mailboxes suffered damage.
In a 14-hour period from the evening of Tuesday Nov. 20 to the following morning, an unknown substance was sprayed on the mailboxes.
The area is bounded by Brighton Road, Riverside Drive, the VIA Railway line and Lesperance Road.
The OPP are working with postal inspectors on the case.
They're asking the public if anyone may have seen what happened.