( CNN ) -- Officials are searching for the driver of a white truck seen on Santiago Canyon Road on Sunday , near the time the Santiago fire started , Orange County authorities said Friday . Chief Chip Prather holds a photo of a white truck similar to the one seen on Santiago Canyon Road . `` These people are not suspects at this time , '' Orange County Fire Authority Chief Chip Prather said . `` They are persons of interest who were seen near the fire in a vehicle like this . '' The vehicle is a white , 1998 to 2004 Ford F150 pickup with chrome tubular running boards . Prather said the information came from a lead called into the investigation 's tip line . A $ 250,000 reward has been offered for information leading to the arrest of the person or persons responsible for the blaze . Watch how residents feel about arsonist » . The Santiago fire , now 27,000 acres and still burning , was deliberately set , officials said Thursday . Several mandatory evacuations remain in place for the Santiago fire , which has destroyed 14 homes and various other structures . Late Friday afternoon , the blaze moved into Silverado Canyon , authorities said . Sheriff 's deputies were evacuating residents in the fire 's path . Watch the Santiago flames rage » . Authorities also suspect arson in the Rosa fire in San Diego County , which burned more than 400 acres before being fully contained . There was no information on the investigation . Elsewhere , the Los Angeles County District Attorney 's Office filed arson charges Friday against a 41-year-old Sun Valley man who witnesses said set a fire in the West Hills neighborhood and walked away . Catalino Pineda is one of five people who have been arrested in arson investigations this week , but none of them has been linked to the major wildfires raging across Southern California . Pineda was arrested Wednesday after witnesses said they saw him lighting a fire on a hillside , police said . The fire was quickly extinguished . The witnesses followed Pineda to a nearby restaurant and called police , who arrested him . Pineda was expected to be arraigned in Van Nuys Superior Court Friday , Deputy District Attorney Steven Frankland said . He is charged with one count of arson of a structure or forest . Pineda is being held on $ 75,000 bail and faces up to six years in prison if convicted . In San Bernardino , east of Los Angeles , John Rund , of Hesperia , was arrested Wednesday on arson charges after a witness reported seeing him in brush near the starting point of a fire Tuesday , the sheriff 's department said . That fire was quickly put out by passers-by . Investigators are trying to determine if Rund , 48 , may have ties to other wildfires . He is being held on $ 750,000 bail . The San Bernardino County District Attorney 's Office on Thursday filed arson charges against Anthony Riperti , 47 , of Redlands . A statement from the office did not say when or where Riperti is accused of setting a fire . He is being held on $ 250,000 bail . In San Diego County , the sheriff 's department this week arrested an adult and a juvenile allegedly seen by an anonymous tipster starting a fire in Vista in the northern part of the county . In a written statement , the sheriff 's department identified the adult as Gorgonio Nava . The Vista fire Department extinguished the blaze before it grew out of control , the statement said . Investigators have determined that the Grass Valley fire in San Bernardino County was not caused by arson , and a preliminary investigation into the cause of the 11,675-acre Slide fire seems to indicate arson was not a factor , sheriff 's spokeswoman Cindy Beaver said . More than 1,600 homes have been destroyed in the past week by Southern California wildfires . E-mail to a friend .
NEW : White truck seen on Santiago Canyon Road near where fire started . Charge filed against man who allegedly set small fire and walked off . Catalino Pineda one of many arrested in arson investigations this week . Arson investigations continue across multiple California counties .