RIALTO (CBSLA.com) — Firefighters are working to extinguish a brush fire near a golf course in Rialto.

The wind-driven Sycamore Fire spread to five acres Monday evening near the El Rancho Verde Country Club, located in the 19400 block of East Country Club Drive.

READ MORE: Power Restored On Westside After Fire At LADWP Facility Caused Outages To About 45K Customers

A San Bernardino County Fire Department spokesperson said the fire was held at three acres as of 5 p.m.

READ MORE: Border Patrol: SUVs Loaded With Migrants Came Through Hole In Border Fence, Believed To Part Of Smuggling Operation

SKY9’s Stu Mundel reports San Bernardino is fighting the blaze on the ground while CALFIRE crews are dropping water from helicopters.

MORE NEWS: Manhattan Beach Police Officer Charged With Sending Sexually Explicit Messages To Teenage Girl

The cause of the fire remains under investigation.