A suspect in the ballot drop box fires that occurred in Vancouver, Washington, and Portland, Oregon, before Election Day is still unknown.

The FBI is offering a $25,000 reward for information on a suspect behind ballot box arsons in the Pacific Northwest ahead of the Nov. 5 election.

Federal authorities are offering a $25,000 reward in connection with a series of arson incidents involving ballot boxes in Washington state and Oregon during early voting last month. The FBI said Wednesday it is seeking the public's assistance in identifying a suspect sought in three incendiary fires.