An arsonist swept through the Hollywood area under the cover of dark, torching vehicles whose flames ignited nearby houses, including one once occupied by Doors frontman Jim Morrison. 
 
 Los Angeles City firefighter Dane Jackson investigates the scene where fire caused damage to a home once occupied by Doors frontman Jim Morrison, at 8021 Rothdell Trail in the Hollywood Hills, section... (Associated Press) 
 
 Burning cars are shown at the site of an arson fire in the Hollywood section of Los Angeles on Friday Dec.30, 2011. An arsonist torched car after car early Friday, sending firefighters scrambling to put... (Associated Press) 
 
 Suyapa Herrera, left, and Agustin Renteria, 10, return to their home where fire caused damage to a two-story apartment on N. Cahuenga Boulevard in the Hollywood section of Los Angeles, Friday, Dec. 30,... (Associated Press) 
 
 An investigator works the scene where fire caused damage to a two-story apartment at 1156 N. Cahuenga Blvd. in Hollywood, section of Los Angeles, on Friday, Dec. 30, 2011. An arsonist torched car after... (Associated Press) 
 
 A Los Angeles Fire Department engine arrives at a fire in the Laurel Canyon section of Los Angeles on Friday Dec.30,2011. An arsonist torched car after car early Friday, sending firefighters scrambling... (Associated Press) 
 
 Suyapa Herrera returns to her home where fire caused damage to a two-story apartment on N. Cahuenga Boulevard in the Hollywood section of Los Angeles, on Friday, Dec. 30, 2011. An arsonist torched car... (Associated Press) 
 
 A Los Angeles Fire Department firefighter is shown at a fire in West Hollywood, Calif., on Friday Dec.30, 2011. An arsonist torched car after car early Friday, sending firefighters scrambling to put out... (Associated Press) 
 
 The four-hour onslaught started shortly after midnight Friday and sent firefighters scrambling to douse fires in 21 locations in Hollywood and the neighboring city of West Hollywood. In nearly every case, the fire started in a parked car. 
 
 Authorities ruled out any possible link to terrorism while bracing for another round of fires and continuing the search for a suspect. 
 
 "We are hoping for the best but anticipating and preparing for the worst," Los Angeles City Fire Chief Brian Cummings said. 
 
 Los Angeles officials urged continued public vigilance Friday and offered at least $35,000 in rewards for information leading to the conviction of an arsonist or arsonists. 
 
 County supervisor Zev Yaroslavsky says the county is offering a $25,000 reward and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives is adding another $10,000 to the reward. 
 
 The city council is drafting a motion to add another $25,000 to that sum, but councilman Tom LaBonge urges citizens to come forward with any information they have immediately. 
 
 Dozens of people were rousted from their homes, power was disrupted in several neighborhoods and Los Angeles police were put on alert in the Hollywood area. One city firefighter was treated and released from a hospital after a fall from a ladder while battling one blaze. No other injuries were reported. 
 
 All of the fires on Friday were in a 2-square mile area and most were in densely populated residential neighborhoods where residents would likely be asleep. 
 
 "This is the most dense part of Los Angeles and West Hollywood. We have 20,000 people per square mile living in this area. One fire out of control could cost dozens of lives," said John Duran, mayor of West Hollywood where four of the fires were set. 
 
 "Turn yourself in whoever you are. Stop it, stop it. We will not tolerate this in West Hollywood, in Los Angeles or anywhere in our neighborhoods," Duran said. 
 
 Authorities were interviewing witnesses and looking for any video footage that may have captured the person, or people, responsible for the spate of crimes. Investigators from four agencies met for a strategy session, while Los Angeles officials summoned investigators from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives. 
 
 Mayor Antonio Villaraigosa praised the coordination of the agencies, saying they're "working around the clock to investigate these crimes and they're pursuing every single lead." 
 
 We will "be preparing for what may be coming tonight," said Los Angeles County fire Battalion Chief Tom Sullivan. 
 
 Fire officials couldn't say whether the rash of fires was the work of a copycat. There was a series of other arson fires early Thursday, also in Hollywood. Two people have been arrested and remain in custody for those blazes, officials said. 
 
 One of the homes was in Laurel Canyon, where Morrison and his girlfriend once lived, neighbors said. The winding road was the inspiration for the Doors' hit "Love Street," and the house was listed for nearly $1.2 million earlier this year, according to real estate website Zillow.com. 
 
 Sandy Gendel, who owns a nearby restaurant, said he heard explosions from what he later determined were likely car tires. He saw flames 30 feet high coming from the deck of the former Morrison house and a gutted Mazda Miata. 
 
 "It was just like a towering inferno," Gendel said. 
 
 Jeff Dorman, who lives in the neighborhood, said he and his wife were awakened by noise in the street. 
 
 As he and his neighbors watched the firefight, he said they worried about embers floating toward their houses because they are so close together. They also were concerned about a firebug being loose in their neighborhood. 
 
 "One spark could have been a huge problem," Dorman said. "The fire department did a fantastic job." 
 
 City Councilman Tom LaBonge said the arsonist is mostly targeting underground parking in mid-century type apartments that have no security gates and putting some kind of incendiary device under cars. 
 
 "These are not trash can fires on street corners. We are just a second away from tragedy," he said. 
 
 Los Angeles Fire Department spokesman Jaime Moore said car fires spread to adjacent buildings in at least three cases, and investigators were looking for patterns that might link the blazes. 
 
 Moore said it is plausible that one person in a car, on a motorcycle or on a bike could have set all the fires, considering the limited area the blazes broke out in. 
 
 Hollywood is served by the Los Angeles city police and fire departments. Adjacent West Hollywood is a separately incorporated city served by the Los Angeles County fire and sheriff's departments. 
 
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 Associated Press writers Sue Manning and Greg Risling contributed to this report. 

 
 
 Police officials reported at least 16 new arson fires early Saturday in Los Angeles, bringing the number of fires intentionally set in the city in the last two days to more than 35. 
 
 Eight of the fires occurred in North Hollywood, three in the foothill area of the San Fernando Valley, three in the Wilshire Division of the Los Angeles Police Department, one on the Westside and one in Lennox. 
 
 Officials said they are not sure if they dealing with multiple arson suspects or if some of the fires were the work of copycats. One law enforcement source told The Times that detectives are considering that more than one arsonist is involved. 
 
 Photos: Hollywood arson fires 
 
 The latest blazes come on top of a series of arson fires that occurred Friday morning. In that string of blazes, 21 fires were set in Hollywood and West Hollywood, making it one of the worst arson rampages in Los Angeles in recent history. 
 
 Among the properties damaged was the Hollywood Hills home where The Doors' Jim Morrison once lived. The home inspired Morrison's song "Love Street." 
 
 
 
 Friday night's fires left L.A.-area residents on edge and investigators perplexed as they began the painstaking search for clues on who had set the fires and why. 
 
 
 
 Nearly all of the fires started with a vehicle being set ablaze. Several times, however, the flames jumped to nearby apartment buildings or houses, causing significant damage at some of the locations. 
 
 
 
 Estimates on the total cost of the damage were not available, although officials from the Los Angeles County Fire Department said that four fires set in West Hollywood alone destroyed about $350,000 worth of cars and property. 
 
 
 
 One firefighter suffered back and neck injuries and was taken to a hospital. His condition was not thought to be serious. 
 
 
 
 Investigators and experts said the fires were highly unusual for even a serial arsonist because of the sheer number of fires in a relatively short period of time. Officials have not said how the fires were set. 
 
 RELATED: 
 
 Ruin, wreckage at Jim Morrison's former home 
 
 Officials seek tips after string of blazes 
 
 Photos: Hollywood arson fires 
 
 -- Andrew Blankstein 
 
 Photo: Plumber Uri Oren works to clear a drain after an arson fire in the carport of an apartment building on Harper Avenue in West Hollywood Friday. Credit: Mel Melcon, Los Angeles Times.
– Los Angeles apparently has one or more arsonists running around. Firefighters battled 16 more blazes overnight, on top of 21 the previous night, mostly around Hollywood, reports the Los Angeles Times. It appears the fires were started in parked cars, and several spread to nearby buildings. The most notable example: A home in the Hollywood Hills section once occupied by Jim Morrison of the Doors suffered damage. (Its road inspired the song "Love Street," notes AP.) Authorities aren't saying whether they suspect one arsonist or copycats.