Is This Election Interference?

This week was got news of ballot boxes being burned in WA and OR. What was the motive, if any, and what will the fall out be from it?

Per CNN:
With just days until Election Day, hundreds of ballots were destroyed by fires this week at two ballot drop boxes in the Pacific Northwest, and investigators are searching for a culprit they say is responsible for both.

Many of the ballots in a drop box in Portland were unaffected, but hundreds of ballots were destroyed in a second ballot box fire in nearby Vancouver, Washington, election officials said. The incidents are believed to be related to a third incident earlier this month in Vancouver.