The fire burned about a quarter-acre of brush in Topanga State Park. No injuries or property damage were reported.
Firefighters determined the blaze was started by a possible arsonist.
A county fire official said two half-burned Roman-candle-type fireworks were found in the area. A driver told authorities somebody was driving in the Isuzu Trooper and tossed the fireworks.
Anyone with more information is asked to call deputies at the sheriff's Malibu-Lost Hills station at (818) 878-1808.
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