Read’s office said it had no additional information about the package. He said officials knew of no other suspicious packages headed to Oregon, but were working with federal partners and urging local election officials to stay alert.

“We are prepared to respond if a package arrives in Oregon, and we will do everything we can to protect Oregonians’ safety and the integrity of our elections,” Read said.

The FBI confirmed that it and the U.S. Postal Inspection Service are investigating suspicious mailings sent to election offices around the country. Some letters contained an unknown substance, the bureau said, and investigators are working to identify whoever sent them.

Recent incidents have prompted evacuations at election offices in Arizona and Louisiana after letters containing white powder arrived. Federal officials also intercepted a package containing white powder and a threatening letter that was intended for Minnesota’s secretary of state. Authorities have not said whether the intercepted package addressed to Oregon contained any substance or threat.

Oregon has experienced election-related mail threats before. In 2023, suspicious mail temporarily halted ballot counting in Lane County.

The latest incident comes as Oregon mails ballots to all registered voters. Ballots must be returned in signed envelopes by 8 p.m. Nov. 3. State officials recommend mailing ballots by Oct. 27 to allow time for delivery; voters can also use official ballot drop sites.

Read said his office and federal partners would remain vigilant. The FBI said it would continue working with law enforcement to respond to each incident and protect the public and elections.