Several vehicles in Tamaqua were sprayed with a white substance that caused their paint to bubble on Saturday.
The unknown substance was sprayed on at least four vehicles in the 300 block of West Rowe Street in the Schuylkill County borough.
When the substance was cleaned off, a slightly-raised bubble impression was left on the vehicles' paint.
So far police have received four complaints, but more may be forthcoming.
The vandals fled undetected.
It is the third recent incident of that nature in Tamaqua, according to police.
Late last week, three vehicles were damaged on Hunter Street.
Earlier in August, more than 20 vehicles were damaged in the area between Gay Street and Clay Street in the borough's north ward.
Some of those incidents occurred near the most recent ones. Clay and Gay streets are near Rowe Street.