The single-engine aircraft went down shortly after 10 a.m. at the Newhall Avenue exit in Newhall. Flames ignited after the plane struck a tree, according to a California Highway Patrol log.
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Witnesses' video from the scene showed a large plume of black smoke rising above the mangled wreckage in a grassy area near the off-ramp.
The cause of the crash and the identity of the pilot, who was pronounced dead at the scene, were not immediately known.
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The northbound 14 in Southern California was closed as a result of the incident.