A magnitude 4.0 earthquake hit Northern California Friday afternoon, according to the USGS.
The quake struck about ten miles N of Ukiah at 4:10 p.m.
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There were no immediate reports of damage or injuries, but the quake struck in an area where firefighters are battling the Redwood Complex Fire.
No further details were immediately available.
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A map showing the location of an earthquake is seen in this undated image. (KGO-TV)