A firefighter was airlifted from the King Fire area after sustaining a "significant injury," a Cal Fire spokesperson said.
The inmate Cal Fire firefighter was hit by a large tree limb and flown to Sutter Roseville.
According to Daniel Berlant of Cal Fire, the injured firefighter will be released sometime Thursday.
As of Wednesday, the fire has burned 92,960 acres and is 38 percent, according to the U.S. Forest Service.
Stay with FOX40 and FOX40.com for the latest information as this story develops.
FOX40's Ben Deci and Tia Ewing contributed to this report.