Fire and sheriff's officials are seeking the public's help in an investigation into William Reed Brock, 44, who was arrested Oct. 24 on suspicion of impersonating a firefighter at the Rice fire. Brock was detained in North County driving an older-model Ford pickup with personalized firefighter license plates. Inside the truck, authorities found fire equipment, including hoses, and clothing from fire agencies. Authorities want to know if anyone has seen Brock at the fires or at fire stations. Contact sheriff's Detective Clayton Lisk, (760) 451-3110, or Cal Fire investigator Gary Eidsmoe, (800) 468-4408.