Law enforcement officials have linked a black or dark-colored Volvo S-60 to two ballot box fires on Monday and a third earlier this month.

Finding the car — and the person or people believed to have used it to target ballot boxes in Portland and Vancouver — may not be straightforward. The car lacked a front license plate and had what police called an “unknown rear plate.”

READ MORE: Ballot-box fires in Oregon, Washington are linked; police identify suspect’s car

In Oregon alone, motorists have registered 3,828 Volvo S-60s, according to Oregon Driver & Motor Vehicle Services. Of those, only 558 have valid registrations, meaning the rest are canceled, expired or transferred.

Police ask anyone with information about the Volvo or the ballot box tampering to contact Detective Meredith Hopper at Meredith.Hopper@police.portlandoregon.gov or call the PF&R Fire Investigation Unit’s tip line, 503-823-FIRE (3473) and reference case number 24-276181.

— Beth Slovic is an editor on the public safety and breaking news team. Reach her at 503-221-8551 or bslovic@oregonian.com.