The FBI has rekindled a decades-long manhunt for a serial arson suspect accused of operating a domestic "eco-terror" cell that lit off more than a half-dozen fires in the 1990s and early 2000s shortly after Los Angeles authorities announced the arrests of a pair of fake firefighters from Oregon – one of whom has a criminal history of arson.

The Los Angeles County Sheriff's Department told Fox News Digital Sunday that Dustin Nehl, 31, and Jennifer Nehl, 44, were arrested after allegedly impersonating firefighters and driving into a restricted zone in a fake firetruck from a fake department.

The FBI is offering $50,000 for information leading to the arrest of Josephine Sunshine Overaker, a suspected domestic terrorist accused of setting arson fires to spread an animal rights message alongside a group of fellow radicals. She, too, has been accused of posing as a firefighter.