The incendiary devices found at mail-in ballot boxes in Portland and Vancouver, Washington, reportedly had the expression "Free Gaza" on them.
The markings are being reported by ABC News, based on information from sources.
Investigators think the two seperate incidents Monday in the two states are connected and have said they have a "suspect vehicle," but so far no arrests have been made.
Hundreds of mail-in ballots were destroyed in the incidents, near the Oregon-Washington border.
Another incident reportedly happened Oct. 8, and the incendiary had "Free Gaza" and "Free Palestine" on them.
Related Story: Ballot Drop Boxes Set Afire in Oregon, Washington, Hundreds of Ballots Destroyed
