MONDAY UPDATE: The fire was 75 percent contained at 76 acres, Cal Fire reported.
Fresno County firefighters are on the scene of a 50- to 60-acre fire near Tivy Mountain east of Sanger on Sunday night.
There is currently lightning in the area and heavy wind, said Fresno County Fire Capt. Jeremiah Wittwer.
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The cause of the fire and when it started was unknown.