The blaze in Jurupa Hills was deemed a three-alarm fire around 2:10 p.m, according to the San Bernardino County Fire Department.
It had spread to about 15 acres as firefighters reported they were working on perimeter control, work made more difficult by the steep terrain.
FONTANA: #SBCoFD OS vegetation fire Citrus, South of Jurupa. BE74 OS reporting well-established fire in Jurupa Hills. Fire mid-slope, light flashy fuels, slope driven, rapid rate of spread. Crew making access to initiate fire attack. 2nd alarm requested. pic.twitter.com/10DAcmyjHi— San Bernardino County Fire (@SBCOUNTYFIRE) November 1, 2020
Photos from the scene showed at least one helicopter performing water drops.
Fire official said there was no immediate threat to structures, and no injuries have been reported.