Fire crews are battling a five-acre grass fire just east of the Zoo Safari Park in Escondido.
The fire started at about 11:45 a.m. Wednesday and is burning upslope near Clevenger Canyon, fire officials said.
The fire grew five acres in under one hour. The department dispatched airtankers, a helicopter and a bulldozer, the incident commander said.
No structures were threatened - including the Zoo Safari Park - as of noon Wednesday, but the area is surrounded by light to moderate slope.
Santa Ana Winds are shifting the fire from the west to the east, causing some control issues for firefighters.
Check back soon for more information on this fire.