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

Newly released surveillance video shows a ballot box being set on fire in Portland, Oregon, last month. The video shows the suspect lighting what appears to be a fuse, then placing it inside the ballot box.

The suspect used an “improvised incendiary device” to start the fire in Portland, Oregon, ahead of the US election.

The FBI is offering a a reward of up to $25,000 for information leading to the arrest and conviction of those behind attacks on ballot boxes in Vancouver and Portland in late October.

Federal authorities are offering a $25,000 reward in connection with October's string of ballot box fires in the Pacific Northwest as they also released new surveillance video in an attempt to find the suspect.

The FBI has released a video of a man they believe is responsible for setting fires at multiple ballot drop boxes in Washington and Oregon.