Ballot boxes in Oregon and Washington were set on fire early Monday, police in both states said.

It is unclear whether the two arsons, which occurred near the Oregon-Washington border, are related.

In the first reported incident, a ballot drop box in Portland, Oregon, was set on fire by an incendiary device, police said.

Portland police responded to reports of a fire at a ballot box on Monday around 3:30 a.m. local time. Multnomah County Elections Division Security responded and extinguished the fire, officials said.

“Officers determined that an incendiary device was placed inside the ballot box and used to start the fire,” the Portland Police Bureau said in a statement.

The office’s explosive ordnance disposal unit cleared the device, police said.

The extinguishing agent helped prevent further damage and protected “virtually all of the ballots,” although three of them were damaged, the Multnomah County Elections Division said in a statement. press release.

Election officials will contact the three affected voters so they can receive replacement ballots, the division said.

“We have several systems and security measures in place to ensure your vote is secure,” Multnomah County Elections Director Tim Scott said in a statement.

No other ballot boxes or official drop-off sites in Multnomah County were affected, the division said.

The Portland Fire Investigation Unit is investigating.

About half an hour later, around 4 a.m. local time, officers in Vancouver, Washington, responded to a report of a smoking and burning ballot box, police said.

“Officers arrived and located a suspicious device next to the box,” which was on fire, Vancouver police said in a statement.

The fire was extinguished and members of the Metro Explosive Ordnance Disposal Unit safely recovered the device, police said.

The extent of the damage to the ballots remains unclear.

The FBI is investigating the incident, police said.